hey, i need some help picking out size for tires. i have a 98 ws6 it is lowerd a inch, im going with newer style Z06 rims , want to go 18 front 19 back,, want to put at least 315 in the back if they fit.. wondering if anyone could help me if they allready done this. if 18*19 wont work i would go 18 all around.. so i guess my question is would 18/275front and 19/315 back be fine? and if im putting 315 in back how wide does the rim have to be?dont want any rubbing .. thanks