These are Baer super street calipers meant to work on Chevelle, camaro, etc. They use drum brake spindles and stock 69-72 front Chevelle or camaro rotors. These are dual piston aluminum calipers. They will fit in a stock 15" rim. I did some research and these are the same calipers used on Ford cobra mustangs of the mid 90's. Decided on a different direction so no longer need them.
One picture shows how they mount on the spindle but it is not included in the sale. This is just for the calipers and brackets, you will need to buy rotors, master, and other things needed to complete the setup.