When restoring my 64 I found a heavy duty bumper on a gmc 4x4 in a junkyard. It was originally bolted to the rear fenders on it's original truck but I trimmed it off and just let it wrap around the back of the fender a little. I didn't like the idea of it being attached to the fenders. This bumper was very heavy and I burned a lot of acetylene to get it straightened out.
http://i305.photobucket.com/albums/nn214/jfnar/1964%20chevy%20truck/61e515e5.jpg


'64 swb stepside (gone)
'57 1 ton
'53 phone truck
'59 swb
'46 1 1/2 ton
'68 swb gmc