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According to the info I have(which could certainly stand confirmation) 930s used
front
pn#930.341.611.00 hubcentric 21m spacer '75-77
pn#477.501.701 hubcentric 21m spacers '78-80
and
rear
pn# 930.331.611.04 hubcentric 28mm spacer '75-89
Up through '80 the 911 and 930 front hubs were the same, '81 -89 front 930 hubs are 21mm wider and so don't use the spacer.
the 930 trailing arm places the 930 hub further outboard than the 911.
964, 993 etc are totally different
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