1966 dart front brakes?

3 1/2" brake shoes --- other than Big Trucks that get up to 6" wide !!!!!!
Only one car EVER used ----- 11" x 3 1/2" brake shoes ----- the 1958 - 1960 Lincoln !!!!!!

Mopars widest shoe ever --- was the 11" x 3".....

I think what he is measuring is the overall total
Height......(my guess...)