[John Brown]

I don't believe trucks used metallic brake shoes, but Corvette and full size cars did. I put metallics on my 1957 Corvette in 65, and a rural mail carrier I knew bought a new 1964 Bel Air and ordered it equipped with metallic brake shoes.

FRICTION MATERIALS STANDARDS INSTITUTE brake catalogs group like metal cores together in the picture section in the rear of their catalogs. When I worked parts, we had 'can use' brake interchanges and would substitute when we were out of a particular number. I wouldn't doubt that a 280 steel core and a 228 steel core could be interchanged. Truck 11x2 shoe number was 280, car 11x2 shoe number was 228. Many times the only differences might be that one has an extra hole that the other doesn't. Other times the web (the flat part of the metal) had a different thickness. Sadly, I don't have an old FMSI catalogs to look those shoes up.