Replacing the rear brakes on a 1950 3/4 ton 3600. The rears are Hucks that are 12x2. I can't seem to find them. The fronts are 11 x 1 3/4 and the base brake shoe number is 141. Many listings show the rears as the same shoe number 141, but that wont work. Any ideas where to go or a brake shoe number?