Bulb packed in on Aero spoiler. Does the lens come off to replace the bulb, or do you have to remove the spoiler from the car to replace from the inside ?
Just done it ! Small hole on rear window side of spoiler with philips screw to remove lamp.
I swapped my 921 reverse lamp bulb over as I am upgrading my rear fog lamp to a red LED 955 bulb from www.hids4u.co.uk