sure thing. 15's with 35's are great. even if you need to grind a little, you'll be happy with the look. soft 8'a I think only go down to a 4" BS with a 15x8, but I could be wrong on that. I'm running 15x8 ProComp Rock Krawlers and they look almost identical to the 8's, but go down to a 3.75" BS.
with that BS, my 35's stick out about 2" from under the fenders, so be careful with laws and such as not all states allow it. some folks like the tires in the fender too so just a heads up...they will stick out a little.
they are out just a bit. if you're interested in the Rock Crawler wheels, I have a photo in my Jeep Profile of them with the tires, no center caps, mounted with stock lugs.