I was beginning to clean the engine compartment on my '73 2L while I have the engine out, and I noticed this bracket (inside the rectangle).
It's inside the Left engine mount, welded top and bottom, with a slot from top to bottom. It's original, because you can see the original yellow paint showing through. The PO had something secured there with 2 screw clamps, but nothing was mounted there when I got it. I looked in Haynes and the AA parts diagrams and neither shows a bracket in that location The car has AC, and the compressor would be located just ahead of this area.
So... what goes there??