I did the same as Mike, my car is pre 06, so doesn't have the spare plugs, so I got the Caterham sub loom. The LED is the Hella unit, from CBS, stuck on with Velcro, and the grey plastic back plate of the unit 'painted' with permanent marker pen in black. Wire feeds along the underside of one of the rear diagonal struts into the boot, stuck on with black insulating tape. Been there over 7 years now, still looks spot on.