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I have a set of 18" Sport Design and needed 15 mm spacers to accomodate the rear rims on 265/35 tires....the ride is a bit rougher than with the 17". I believe the bolt pattern is 5 x 100 ...don't quote me on this...finally I also read from other sources that the 98' boxster was modified to support the 18" wheels....I'd very careful in going that route on a 97'
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