Staggered wheels, what size tires?

[Nicolaus Pro]

So I have a 10" wheel in back with a 225/50. I have a 8.5" in front, and would like to go with the same amount of stretch. What size should I get? Could I run a smaller sidewall in front too?

[Qwaffe]

take a look at www.tyrestretch.com and see if you find any 8.5j wheels with a tyrestretch that is like the one you have in the back