I've got 17s and it just misses. Two of my friends have the same issue. It's a pain as it looks shit! I changed mine to a 26mm arb from a 2.ol pinto and it was fine. I've tried 2wd cossie and 28mm Granada cosworth arb an all do the same. I've even bought new tca's.

Think I'm going to machine the arb down.