if its 5 on 4-1/2 they will most likely fit.
Probably 11" drums and 2-1/2 or 3" wide shoes.
Pretty much all the 65 and up non-small bolt brakes will interchange as a complete unit. 7-1/4, 8-1/4, 8-3/4, 9-1/4, DANA.
Some earlier and smaller rear backing plates will only have 4 mounting holes. Just drill for the fifth!