After talking with Autoworks about tire sizes in relation to ride height and fenderwell clearance issues, we determined the best thing to do when ordering a set of wheels is to consult with the company to determine which would work best. Tire sizes on cars with low ride heights will need more careful consideration compared to those with a stock ride height. For cars like this, CPC recommends 235/45R17 (shown) as a good size all around. For staggered sizes, a 245/45R17 might work in back, but be careful about fenderwell clearances. For larger '67-'68 cars, a 245/45R17 might be a good fit.