LCA from a '72 Drum to '73 Disk

Only differences I'm aware of is factory anti roll bar tabs, either not there, or different between 72 earlier/ and 73/ later

True, the sway bar tabs, if so equipped, are mounted in a different location, but are the same tab! The 72 and earlier sway bar mounts under the K frame, and as such the tabs are mounted on the bottom of the LCA. The 73 and later sway bar goes thru the web of the K frame and puts the tabs at the top of the LCA!