Dealt with these guys before, they're happy to answer any questions as well http://www.ebay.co.uk/itm/VW-Golf-GTD-GTI-Golf-R20-Rear-Lights-LED-Tail-Lights-Golf-R-MK6-RHD-L-LIGHTS-UK-/181677090576?pt=LH_DefaultDomain_3&hash=item2a4ccc6710
I have changed mine from LHD to RHD drive. It is a bit tricky and you do have to snap a bit out, just need a bit of patient and its all good.
Kinda hard to explain, you have to gently smash out the red reverse light surround, then fit a white bulb, its quite easy when you know how to do it.maybe a video on youtube?