Details
Please do not confuse the original Winchester 37 with the later model 37A.
Parts have no interchange at all between them in any size, gauge, or instance.
I am not sure if even the buttplate screws are similar enough to interchange, and the wood fit is completely different in configuration where adjacent to the frame.
Kirby
I am a Winchester gunsmithing specialist, especially for the older Classics like the 37, 97, Model-12 and Doubles.