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8 inch wide with about +25 offset will sit right on the guards. I know if i buy brand new wheels im aiming in that ballpark.
8 wide +0 pokes quite alot though before you consider it.

On the topic...

you can run up to 18's if you really want, but its not for everyone lol. any wider than 8" or 215 wide tyres and it will scrub at the front when steering full lock (depending on offset and tyres, but...

Few pics. Might give you a better idea of what you want?
http://uploads.tapatalk-cdn.com/20160511/91fbe81b9c971ac5ad9f74eccc29c63c.jpg...

15x7" +35 will be the best/sensible choice. Anything else 15" is usually at least 8" wide and a +15/20/25 offset which will look like **** unless you have rolled your guards and have it slammed on...