HOW MUCH BACKSPACING FOR 22X10

How Much backspacing should I get for a 22x10 on a 2004 bagged silverado? I am getting ready to order some 22x10 Boyd Coggington wheels. I would like to get the 22x8.5 but they say there are no longer 22x8.5 hoops available. Anyways how well do the 22x10 tuck with the right backspacing?

Thanks for the help