My 993 came to me with mismatched Mich Pilot sports, 205/50/17ZR and /255/40/17ZR.
Fronts are wore out and the backs are nearly new. But very different tread pattern.
I can get a pair of fronts, Mich Pilot sport but at $500/
pr approx.
I can also get 4 Sumitomos in the correct size, speed rating, for less than the pair of pilot sports.
I think I'm going with the Sumos, what do ya think? Will I be turned away at Porsche rallies? Pics follow.

Last pic is the Sumitomo