bodyd caprice classic

im looking to body a box for a friend. what offset 20's do i need to look for? or will 22's fit? thanks in advance.
 
josh

+15 offset 255/35/20 is 27.02" overall dia. 235/30/22 is 27.55" overall, so you have to figure how tall is the bottom of the fender to the top and that will give you an idea.