here, hopefully everything you need.

http://www.golfgtiforum.co.uk/index.php?topic=75432.0
Right it appears that the lower 2 sections are "spoiler" and "exhaust trim" and on the gti and ed30 they are joined and if replaced are the straight swap. That post appears to be people trying to split these two sections to do the carbon fibre replacement exhaust trim. The R32 can be split but it doesnt appear anyone makes an "exhaust trim" to match the gti exhaust position.
So......the ed30 looks like an ideal replacement.
Back to insurance, shall i just say the black plastics have been colour coded and leave it at that. I'd be surprised if this would increase my premium?
Also would it be easier to give the bodyshop primed r32 skirts or will it be relatively easy for them to flatten and paint the gti ones?
Anyone know if the lower splitter on the front of the std gti is removable to be painted, dont want any chance of overspray