Rear bumper is a GM 2005 rear, fits pretty nice compared to an ugly stock unit from 81. Just went to canadian tire about 5 miles away and back for my first trip, they seem to work nice. have a few buddy's with smaller 35's and they like them a lot and seem to wear really well mileage wise. all I know is they are a bit bigger and not quite as wide as the 38.5x14.50's I had and steer a bit better. Plus they sure look nicer.
Glad I have a big block to turn them though.