The Michelin TRX tires might've been the best choice, depending upon which other tires they had to chose from, and how the wheels are sized. Granted, a second set of tires which better filled out the huge flares would've been ideal, but the TRX tires are in fact a true metric tire and debuted in '79 IIRC, so not terribly out of place on a first gen RX7.
Was that really necessary? We "olds" will enjoy it, too.