I have a 1970 Mustang Mach 1 and would like to do a staggered setup and was thinking of an 18x9.5 in the rear. The wheel has a -4mm offset. Anyone running 18x9.5 in the rear, what is the ideal tire size so I don't have any rubbing? My rear has 4.5 mid leaf springs so it sits just a bit under the stock height. I'm trying to avoid any modifications to the fender lip. Thanks in advance.