Measure 17mm, 19mm, or 21mm wheel nut covers across the flats, and why a cap will not replace a lost locking wheel key.
Key matching guides — these articles answer common questions about anti-theft wheel keys, locking nuts, and wheel bolts. They are specific to wheel security hardware, not general shop FAQs.
For other products (TPMS sensors, trims, badges, and similar), see the detailed information on each product page in our catalogue.
Guides & Tips
UK guides on locking wheel bolts, TPMS sensors, headlight modules, keys, switches, exhaust tips, body trim, boot badges, oil dipsticks, pedal covers, and accessories - written to help you identify the correct part before you order.
Wheel Bolts
Tyre Pressure Sensors (TPMS)
TPMS sensors, warning lights, programming, and ordering the correct sensor.
Ballast Modules
Headlight ballast units for xenon and LED headlamp systems.
Programmable Keys
Buttons & Switches
Exhaust Tips
Large Trims
Car Accessories
Key fob shells, LED lamps, wheel nut covers, and other cosmetic accessories.
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Key fob shells and covers explained
Shell vs cover vs new key - when you need programming and when you do not.
Read guide →
- LED number plate lights, repeaters, and interior lamps Plate lights, side repeaters, and interior LEDs - match the model, and keep the plate lamp white. Read guide →
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Wheel nut covers: 17mm, 19mm, and 21mm
17mm, 19mm, and 21mm caps. A cover does not remove a locking wheel bolt.
Read guide →
BMW Badges
Mercedes Badges
Oil Dipsticks
Vehicle Pedals
Choose a model-specific LED number plate light, side repeater, or interior lamp, including CANBUS notes and UK plate-light colour.
Match Mercedes boot letters such as A180 or A200, choose chrome or black, and tell wing emblems apart from boot badges.
Match BMW rear boot letters to the model text and finish, and tell 172mm M boot badges apart from 118d-style lettering.
Choose sport pedal covers for manual or automatic cars, check left-hand-drive listings, and measure the pad before ordering.
How to tell a dipstick from a guide tube, read the OE number, and match Mercedes CDI sticks or a VW and Audi guide tube before you order.
Reset the tyre pressure light after a tyre change: indirect vs direct TPMS, button and menu relearn, drive cycles, and when you need a new sensor.
Diagnose xenon ballast vs bulb failure, read the label on your control unit, match OE part numbers, and order the correct headlight module.
Key fob shell vs silicone cover vs programmable key – when to transfer electronics without coding, flip-key blades, and matching listings to your remote.
BMW and Mercedes chassis codes, M Sport vs base bumper fitment, spoilers vs splitters vs diffusers, and what to photograph before ordering body trim.
How to measure tailpipe diameter, match inlet and outlet sizes, clamp-on vs weld-on tips, bumper clearance, and UK MOT notes for universal exhaust tips.
Window and mirror switches, OE part numbers, left/right fitment, connectors, and telling a switch fault from a wiring problem.
Why modern keys must be cut and coded by a professional, what programmable means, immobiliser security, and how to order the correct blank or remote.
The full reference on locking wheel bolts and removal keys – McGard and Farad patterns, OE cross-reference, UK vs import fitment, photo matching, lost keys, and when to replace bolts.
Xenon D1S-D4S types, LED driver modules, failure symptoms, OE ballast part numbers, UK vs import headlamps, and how to identify the correct replacement module.
Direct vs indirect TPMS, 433 MHz vs 315 MHz, common OE part numbers, Schrader and Continental suppliers, relearn procedures, and ordering the correct sensor for UK and European cars.
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