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Just the back, but it's the spring holder on the strut that's the problem, not the arches. Carefully modded mine with a large hammer and 1/2" drive extension.
Then roll the arches. Late Classics came with 205/50 R16. If you increase the wheel size you need to reduce the profile. So, 17's need 225/45/R17 and 18's need 225 35/ R18's.
But P1's where available with 225/35/R18's hope this helps