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I believe that original FIA wheels were 6.5" and 8.5" wide.
It looks like the outer "Dish" of the wheel is the same on the 7.5" and 9.5" with the extra inch added to the rear rim and then the centre boss extended by about an inch.
I have both 427 and FIA wheels here with 295 Avons on them. It looks like the rears have around an extra inch of caliper clearance compared to the 427 wheels.
I could take some measurements tomorrow (It's almost 11:00pm here right now) if it's would be of any help.
P.S. I have an "Original spec" Coupe chassis and body coming to me in the next couple of weeks, so if you are building an orig. spec. Coupe I might have even more dimensions then. :-)
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