Obviously the 12a-style 13's won't fit the GSL-SE bolt-pattern, but I think I've found a good deal on some 13's in 4x114.3 for autocross. Anyone here runs 13's? How's the brake clearance?

 

Searched before posting, got to page 8 before I found what I was looking for... The answer was "maybe". heh

Specifically, 13's from a Toyota Corolla SR5. Figure someone out there must have tried this at some point.

 

It depends on the wheel. A spun steel wheel is thinner than an aluminum wheel so it has a better chance of working. However, there is a good possibility that the wheels you have in mind would work.

First off are they steel or aluminum?

All that will really matter is the inner diameter as far as brake clearance is concerned. If the offset/backspace is right and the inner diameter is big enough it should work. It isn't too hard to get this info.