Wheres the pics of that custom bumper ???
For wider wheels - you can often use Ford F150 rims, Dodge D150, or early Jeep CJ rims. They were all 5 x 5.5 spacing. Craigslist can be your friend.
Just check the back spacing to be sure they don't rub against the brake hardware or axles.
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MarkB.NV
1991 Tracker, 8valve 1.6L, 5 spd, 4x4, 2 door, soft-top, 103,xxx miles, w/ 2 in suspension 2 in body lift, 30x9.5/15 MT tires.