Now that I started checking I have found another set to rebuild mine ('48) at J Carter's and the bumpers look bigger at the base.
http://www.oldchevytrucks.com/cart/product.asp?prodid=CB157&i=9648||||
Still have not found the later mount metal shackle parts 1/2 or 1ton anybody see them anywhere, thanks Jim D
(hope I put the link in there right)


pictures below
https://picasaweb.google.com/111413431667404132006
Jim D - '48 GMC 1ton pickup