Door latch rebuild. Finding parts

[ActionYobbo]

On my 39 truck I started rebuilding the door latches. I did the passengers side first and it was easy with just a bit of welding to repair the worn surfaces. Now the drivers side. It needs more welding to fix the worn surfaces and it was missing the anti rattle spring plate (see pic). Where can I get this part? Or do I need to get another latch for parts?
Thanks

I need the part circled in red.
This is not my picture I found this picture on the internet and used it to show what I need.