ok mate all 3 door mk 4's have the exact same floor pans (pretty much identicle shells im lead to belive) i think the main differnce is some 1.3's dont have sun roofs ect

the recaros you on about are the 88 spec mate

xr3i bumpers are the same as rs turbos (2 styles and one rare extension lip) the bumpers are pretty cheap and easy to get off ebay ect

check all the archs for rot and also the battery tray and fuse box the wheel well in the boot is also a common place for rot but this is pretty easy to sort given the right tools

hope this helps mate