I'd have to say 7.5" is the widest. Sue's Bug has 9" wheels under 2" wider fenders with an inch cut off of the bump-stop landings. The wheel is about .5" from the edge of the fender, and a little less than that from what's left of the bump-stop.
I believe NO_H2O has stock fenders and 16"x??" 964 wheels on his...maybe he knows...
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Yetibone
'71 1302S 1.8
'73 1303S 2.3
'83 928S 4.7
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