Door latches

 There are two door types, one is what I call the FRAMED door on early airframes and then the STAMPED door on later builds. 

Framed (blue) and Stamped (white) 

The door LATCH mechanism is different in each door type framed/stamped but then there is another difference in outside door handles, Protruding and Flush. 

Protruding (red) and Flush (white)

Here is my question for other Stinson experts, knowing that Stinson was building aircraft in Detroit Michigan, did Stinson build their own door latch or did they use door latches that were already being built by another company?

Framed door Latch 

Stamped Door Latch

Supposedly if you can find a Piper pacer at the salvage yard, they had the same mechanism for the doors

It would be nice if we knew of a cross reference for such a thing! Please add a comment below if you know of anything like that or contact me directly.