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Some of the 964RS used aluminum bolts(#20) all the other 964 including turbos used the steel(#15), obviously the aluminum versions are lighter. They are also NLA.
964 use 45 tooth ABS wheel teeth, 993 use 48. either assembly may be used in either 964 or 993 hubs as a unit.
993 uprights are alumium 964 are steel, 993RS(aka GT2EVO) are also aluminum but modified to eliminate bump steer and need a different tie rod.
I use 993 axle/ABS w/ 993RS uprights
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