Dave your calipers look like GM units.When I put Scotts conversion on the part numbers were ground off but was told they were GM but do not know what from
Answering my own question again, it turns out that this was a very common caliper. Used on virtually everything from 74 up into the 90s on Dodge trucks & most RWD cars , , Duster , Volare , Magnum , Cordoba , Diplomat, 1/2 tons trucks & vans.