What J rating for my classic trackday car?
 

Howdy

As the title suggests I have a classic impreza which I'm turning into a trackday car. I recently purchased a set of D2 8 pots which my current 17 inch wheels won't fit over. They were on the car when I got it.

I'll probably try and find a set of used wheels to keep costs down (didn't want to have to get wheels now) but can anyone tell me what is the widest wheel I can put on a classic without damaging the wheel arch etc?

Cheers