Chesrown 67 OAI

I have a broken return spring holder in the left front door latch mechanism of my 42 Olds #66 Coupe. I am looking for an entire door mechanism or someone that may have a broken one that i may scavange the one small part i need. These door latches are the same on all chevy, Olds, Pontiac from 1941-47. For the part i need, right or left door doesnt matter. Can anyone help? or steer me in the right direction!!