You had better check that out thoroughly.
IIRC, some 15" wheels don't clear our brake callipers, some do.
Also, to fit 35's, you will need a lift and some body trimming (easy to do though).
And of course, you need to check the offset.
Look out Tom4B, now that you have gone back to wimpy tyres, you might have a challenger for the supreme title of "OFH".
PK