Ok, so I made up a rough picture tonight on MS Paint of my idea for the replacement Stock Swivel piece. It will be made from 5/8 Aluminum Rod. Drilled out to accept the original pins and rivets. I will make some steel bushings to replace the steel that originally protrudes from the side of the swivel piece. The bushings will be floating and held in place by the rivets when pinned. That will give it more durability than having the stock pivot on aluminum.
--------
Ordering some aluminum rod off the interwebs. Will be waiting for the materials to arrive...