Learned new terminology today. This is called a coin return lever “porkchop”
https://www.arcadeadventures.com/coin-return-lever-porkchop/
I searched coin reject lever, coin door assembly parts, coin door assembly quarter release device, coin mech door lever, ect. related terms.
Finally I created a post on the forum below and they directed me to a current thread:
https://forums.arcade-museum.com/showthread.php?t=467782&highlight=coin+lever&page=2
These are what the 3d printed ones look like:
