315/60R15 fitting on 67 -search down

[pbmcauliffe]

I guess I din't realise the search is gone, and a google search for this site didn't help me, so here goes.

Currently running 275/60 on the rear and bagged, so the 15x10 w/4" bs didn't fit so I went with a 15x8 w/4" bs and that worked (barely, close to the outside fenderwell).

Now I would like to go to a 315/60/15 or 30/31x13.5's and curious if anyone has ran this size w/o narrowing the rearend or having them stick out the fenderwell, if so what rim size and b.s did you have? I already have another set of wheel tubs to extend mine and there is room to the frame, so that is no problem, the rearend is a 4.11 posi that has been gone thru so I would like to get away w/o changing it.

Maybe a 15x10 with 6" bs?