alot of guys run 27s on the right and 26s on the left. i dont pay much attention to that anymore, its more about roll out. i have 26s that measure bigger than my 27s. as long as i can get the stagger...
there are guys out there that build rearends, they usually have a jig they can put it in antell if its straight. sometimes its hard to tell in the car, but if you can get a straight edge on it...