You can get a 205/40 over an 8" rim, bit of a squeeze, but it can be done. Try and sort yourself some hubcentric spacers if you can.....they're not cheap, about £100 for a pair, but much, much safer in the long run. Oh, and depending on how thick the spacer is, then it's also a good idea to get slightly longer wheel bolts No probs, hope you get it sorted.