The only wheels currently in production are made by Bogart. I don't know the exact dimensions, but call them up. They'll know what you need. Weld is working on some right now, but they're not available yet. The first set they came out with didn't fit right. There are some discontinued Weld XP's that fit, but they're hard to come by. Sorry, not sure on the exact size. I believe they're 15x8 6.5" backspacing.
BTW, any 15" wheel will require you to remove or relocate the rear sway bar.