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The O.D. of 90.5 and 92's should be the same. Are they made by same company? Also, the seal comes from the top of the cylinder, not the sides. Yes, it is ideal to have a tight fit all around, but can have "slop" that's acceptable by some. The cutter could have been set on the big side when they were machined.
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1970 T1 W/MassIVe 2913cc RAT/?EFI? w/direct fire (very soon) and 915 trans 
1962 SC 1776cc SP 944NA brakes, 993 wheels
VKG
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