Defender L663 Side Box Essentials Checklist: 6 Storage Add-Ons for 2026
NinthXA defender side box is the side-mounted exterior storage container fitted to the rear quarter panel of the Land Rover Defender L663 (2020 onward). Mounted between the rear door and the wheel arch, it locks shut, sheds water, and frees up roughly 30 litres of cabin space you would otherwise lose to wet kit, recovery rope, or muddy boots. This checklist covers the six exterior storage parts that work together as a system — the side box itself plus the D-pillar pod, engine bay covers, rear door ladder, roof basket, and trunk sill guard — with real prices, fitment notes, and an honest take on which pieces matter for which use case so you do not buy a £337 side box and then realise the door swings shut on a piece of webbing every time.
Why a Defender L663 Side Box Is Not Optional Once You Carry Wet Kit
The L663 cabin trim is sensitive. Land Rover used premium woven floor mats and leather-trimmed seat backs across the 2020+ range, and those materials do not forgive a soaked recovery strap or a sandy wetsuit thrown across the boot. The side-mounted storage box was originally a Land Rover Special Vehicle Operations accessory (the factory part lists at £840 OEM); aftermarket equivalents from us, Chelsea Truck Company, and Project Kahn sit in the £300–£550 band.
Once you fit a side box you will quickly find you also need the four supporting parts below — a D-pillar cubby for fast-access kit, engine bay covers because the OEM trim under the bonnet is the next thing to crack, a rear ladder if you also run a roof basket, and a sill scuff plate so the boot edge survives the dragging recovery rope you can now actually store outside.
| # | Part | Approx. £ | Approx. $ | Function |
|---|---|---|---|---|
| 1 | Exterior Side Storage Box | £337 | $454 | Lockable side-mounted box on rear quarter |
| 2 | D-Pillar Exterior Storage Box | £522 | $703 | Slim cubby on the D-pillar for fast-access kit |
| 3 | Engine Bay Panel Covers | £272 | $366 | Replaces brittle OEM under-bonnet trim |
| 4 | Aluminum Rear Door Ladder | £322 | $434 | Roof access for basket-loaded vehicles |
| 5 | Aluminum Roof Cargo Basket & Cross Bars | £280 | $377 | Adds 1.4 m² of roof load surface |
| 6 | Trunk Sill Scuff Plate Guard | £52 | $70 | Protects boot edge from dragging gear |
Read in order — the rationale for each part depends on the one above it.
Part 1: The Side Storage Box Itself
The Exterior Side Storage Box for Defender L663 (£337 / $454) is the part that started this checklist. It is a lockable matte-black ABS box that bolts to the rear quarter panel between the wheel arch and the rear door on Defender 90, 110, and 130 (2020-2024 model years). Internal volume is around 28 litres — enough for a 20 m recovery strap, a small first aid kit, a folded tarp, and a pair of gloves, with room to spare.
The lock is keyed independently of the vehicle's central locking, which is the right design choice for a part you will sometimes open with muddy hands and not want to faff with the proximity key. We see this box ordered most often by owners who already have a roof rack and have realised the dry storage on the roof is a hassle to access during a wet recovery — the side box solves that specific problem.
Buy this if: you regularly carry wet, dirty, or rope-based recovery kit and you do not want it in the cabin. Skip if: your Defender is a school-run truck that never sees mud — the visual change adds rugged-look styling that not every owner wants.
Part 2: D-Pillar Exterior Storage Box
The D-Pillar Exterior Storage Box for Defender L663 (£522 / $703) is the part most people miss when they first look at the side box. It is a smaller, slimmer pod that mounts on the rear D-pillar — the vertical body section behind the rear side window. The internal volume is smaller (around 8 litres) but it is at chest height and opens with one hand, so it is the right home for the items you actually grab in the rain: gloves, a head torch, a small tool roll, a roll of self-amalgamating tape.
Fitment is to L663 90, 110, and 130 across the 2020-2025 model years. It uses existing trim mount points, so no drilling — you remove four OEM trim clips, mount the bracket, and reinstall. The whole job takes about 30 minutes per side.
Buy this if: you already have or are ordering the main side box and want fast-access storage for small items. Skip if: you only carry kit in big loads — the small volume is wasted on full-size recovery gear.
Part 3: Engine Bay Panel Covers
The Engine Bay Panel Covers for Defender L663 (£272 / $366) often surprise people on a "side box checklist", but the connection is direct. The OEM under-bonnet side trim on the L663 is a thin polypropylene that cracks at the front clip after roughly three years of UK winters — exactly the timescale at which most L663s are now arriving on the second-owner market.
These replacement covers are a thicker ABS pressing in matte black with the same mount geometry. The pair fits L663 110 and 130 (the 90 has shorter covers and uses a different SKU). If your side box install is part of a refresh after picking up a 2020-2022 L663, these covers are the panel you will want to do at the same time because both jobs involve opening the rear quarter and the bonnet area in one go.
Buy this if: you are doing the side box install on a 2-4 year old L663 and the under-bonnet trim is already cracked. Skip if: the OEM covers are still in good condition and you are not bothered by the matte-vs-gloss texture difference.
Part 4: Aluminum Rear Door Ladder
The Aluminum Rear Door Ladder for Defender L663 (£322 / $434) belongs on this list only if you also run a roof basket (Part 5) — otherwise it is unnecessary. The L663 roof line is high; on the 110 it sits around 1.97 m at the rail per the Land Rover dimensions page, which is above arm reach for almost any owner trying to throw a duffel onto the rack from ground level.
The ladder bolts to the rear door using the OEM spare-wheel mount holes, so on Defenders fitted with the spare wheel on the door it replaces the spare-wheel carrier (you will need to move the spare). On Defenders without the door-mounted spare it bolts directly. Load rating is 150 kg, which is enough for a typical adult plus a 30 kg loaded roof bag.
Buy this if: you also ordered the roof basket below and your Defender is a 110 or 130. Skip if: you have no roof storage — the ladder is purely an access part, not decoration.
Part 5: Aluminum Roof Cargo Basket & Cross Bars
The Aluminum Roof Cargo Basket & Cross Bars for Defender 90/110 (£280 / $377) is the upper half of the "side + roof = full external load" system. The basket is a powder-coated aluminium frame, roughly 1.4 m × 1.0 m on the 110 (slightly smaller on the 90), with a 75 kg dynamic load rating per the maker's spec sheet.
A roof basket changes how you pack the truck. With a side box and a roof basket fitted, the cabin keeps the dry, soft kit (sleeping bags, dry clothes, food) and the exterior carries the wet, rigid, or bulky kit (jerry cans, recovery gear, awning poles). That split is the actual reason both parts exist on the same vehicle.
Buy this if: you camp, overland, or carry awning poles and want the cabin clear of long items. Skip if: your loads are small enough to fit inside the boot — the roof basket has a real wind noise cost above 50 mph and you should not pay it for nothing.
Part 6: Trunk Sill Scuff Plate Guard
The Trunk Sill Scuff Plate Guard for Defender L663 (£52 / $70) is the cheapest part on this list and the one with the highest "wish I had fitted it first" rate among our returning customers. The L663 boot sill is a painted aluminium edge that picks up scratches almost immediately once you start dragging a recovery rope, a sand ladder, or a tool box across it.
The scuff plate is a 2 mm stainless steel cover with a self-adhesive backing and a brushed finish. It fits L663 110 across 2020-2024 model years (the 90 has a shorter sill and uses a different cover that is not part of this SKU). Installation is 10 minutes — clean the sill, peel and stick, press for 60 seconds. If you are buying any of Parts 1, 4, or 5 above, add this scuff plate to the same order; it is the part that protects the truck from the parts you just bought.
Buy this if: you are buying any other part on this list. Skip if: you never drag gear across the boot sill — a rare answer in practice.
How These Six Parts Work as a System
The order matters because the parts share a single design problem: an L663 used for actual outdoor activity quickly outgrows the boot. The side box (Part 1) gives you exterior dry storage; the D-pillar pod (Part 2) gives you fast-access storage; the engine bay covers (Part 3) protect the next panel that will crack; the rear ladder (Part 4) and roof basket (Part 5) extend exterior storage to the roof; the sill guard (Part 6) protects the truck from the gear that now lives outside.
A reasonable spend pattern, in our order data, looks like this:
- Tier 1 (most common, ~£389 / $524): Side box + sill guard. The pair that solves 80% of the "wet gear in the cabin" problem.
- Tier 2 (~£967 / $1,303): Tier 1 + D-pillar pod + engine bay covers. Adds fast-access and addresses the OEM trim weakness.
- Tier 3 (~£1,785 / $2,407): Tier 2 + roof basket + rear ladder. Full external load capability for overland and adventure use.
The full Tier 3 list lands at roughly £1,785 / $2,407, which is meaningfully below the equivalent OEM accessory list price of around £2,400 from Land Rover SVO for comparable parts.
Defender 90 vs 110 vs 130 — Fitment Notes
The L663 comes in three wheelbases — the short 90, the standard 110, and the long 130. Most parts on this list fit all three, but not all:
| Part | 90 | 110 | 130 |
|---|---|---|---|
| Side box (Part 1) | ✅ | ✅ | ✅ |
| D-pillar pod (Part 2) | ✅ | ✅ | ✅ |
| Engine bay covers (Part 3) | ❌ (different SKU) | ✅ | ✅ |
| Rear door ladder (Part 4) | ✅ | ✅ | ✅ |
| Roof basket (Part 5) | ✅ (smaller) | ✅ | ❌ (different SKU) |
| Sill guard (Part 6) | ❌ (different SKU) | ✅ | ✅ |
If you own a 90 or a 130, drop us a message before you order — two of the parts above require the body-specific variant.
Frequently Asked Questions
Does the Defender L663 side box require drilling?
A: No. The exterior side storage box mounts to existing M8 threaded points on the rear quarter panel that Land Rover used for the original SVO accessory bracket. Removal returns the body to OEM with no visible damage.
How weatherproof is the side box?
A: The lid uses an EPDM rubber gasket and the lock is a brass cam with a stainless tongue. In our salt-spray testing the seal kept the interior dry through 72 hours of continuous spray; in normal UK / EU weather conditions you should not expect ingress. The box is not designed to be submerged — fording above sill height will push water past the gasket.
Can I open the rear door with the side box fitted?
A: Yes. The box clears the rear door swing arc on all three wheelbases when the door is at full 90° open. We checked this on a 110 with the optional rear door step also fitted — both work together.
Will the side box fit a 2020 launch-spec L663?
A: Yes, fitment covers the 2020 model year onward for the 110 and 130, and 2020-2024 for the 90. The 2025 model year update did not change the rear quarter geometry.
Do I need a roof basket if I have the side box?
A: No. The side box solves the most common storage problem (wet exterior kit) on its own. The roof basket adds capacity for long or bulky items — awning poles, traction boards, jerry cans. Pick the basket only if you actually carry those loads.
What is the warranty on these parts?
A: Two years on all six parts in this checklist, covering powder coat, mechanical components, and the lid gaskets. Cosmetic scratches from in-use abrasion are not covered.
Disclosure: we sell the six products listed in this guide on our own store; pricing shown is our retail price at time of writing. We profit from sales of the kits described above.
Summary Box
A Defender L663 side box belongs on any truck that carries wet, muddy, or rope-based kit. Add the D-pillar pod for one-handed access, the engine bay covers if your OEM trim is cracking, the rear ladder and roof basket if you camp or overland, and the sill scuff plate guard regardless — it is the £52 part that protects the much more expensive parts above it. Tier 1 (£389) covers most owners; Tier 3 (£1,785) is the complete external storage system. All six parts ship from our Defender L663 catalogue with two-year warranty.
