Kirk,
I can't speak for the A3 chassis, but I was able to run the 205/55/14 Hoosiers w/o any spacers on a 14x6 et38 rim on an A1. Talk to Bill Suloff, he probably has the answer. He also has some really 3/4" T6061 spacers available.
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MARRS #25 ITB Rabbit GTI (sold) | MARRS #25 HProd Rabbit
SCCA 279608