I'm pretty sure that if it's a 73 A body, the calipers will be forward mounted.(at least every one I've seen is) They changed the K member in 73, for different/better motor mounts and also changed the K to allow the swaybar to pass through a groove in the K and moved the swaybar tabs inboard on the LCA's. This allowed a shorter length swaybar and allowed this swaybar system to work with forward facing calipers.