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Summer rear width wheel size for later model 964's were 17" x 8". The turbo look rear wheels had 17" x 9". The turbo had 8"/10" x 18" wheels
The question was regarding a set of 17s, at least that the way I interpreted it. So 17x9 ET 55 (96536212800) is not incorrect, besides early turbos (pre-'92) had 17s.