Fred,
David pretty much nailed it. The FFR is designed for the Mustang wheels which have a backspace of I think 5" or 6" which doesn't leave much dish for the wheel.
The pin drive option is much narrower (very close to original pin drive width) so you can run the deep dish wheels from any manufacturer- bolt on or pin drive. Best of both worlds IMHO as not everyone wants to run true pin drive wheels.
For this reason, I'm not convinced that offering pin drive standard is a good option on a replica as the adapters are readily available albeit a bit expensive.
Just my 2 peso's worth- Bob
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