I'm assuming you would probably have 235 width rubber on the front 8.5" rims, but you would need significantly wider than this on a 9.5 width rim (255 width rubber I'm thinking?).
235 width rubber is generally the widest people seem to get on their MK5 GTIs, especially if you're going to put coilovers on it... Staggered sets are much less beneficial on a fwd car as well and i'm positive those back rims will rub even if you get guards rolled etc. The best test is to put 3 mates in the back and then hit some bends - you'll know straight away 
Is it possible to find another set from somewhere and get the two 8.5" rims from that set (hopefully someone might want a full set of 9.5" rims lol)?
MY07 GOLF GTI
5-Door l Tornado Red l DSG l Leather l Xenons l MFD2 l TCP T.B.E l DNA stage 1
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