I have an old Napa catalog. It shows the GMC as 13x3 1/2 in. shoes. The part # is 273R or 60R. The Chevy shows 12x2 in. brakes with # 310R shoes.
If you replaced the adjustment screw match it with the old one. I remember some model back then had one longer then the other.


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.
1972 Chevy c10 Cheyenne Super
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