for the OP, here is 9.5+15 on my stock bodied 13...
not the best pic, but it gives you an idea. its pretty much flush, little tuck/poke. To achive this look (if thats what you want/going for) you'll need 57mm more. so i guess a 50mm spacer.
http://www.1010tires.com/wheeloffsetcalculator.asp <---- for all your wheel offset calculation needs/questions