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As I remember the 1953-55 drums are 12 inch but the '56 on up fronts which are more readily available (they ran that size for years) are 12 1/8. I solved that by finding front 1956 F250 backing plates from a junkyard. This was some years ago. On the rear, I swapped axles from a later truck which had 4.10 gears as the original 1956 was 4.86 and too low of ratio for modern roads.