1931 Plymouth PA Upper Cooling System Housing

[TodFitch]

Looks like the PA has a unique (at least for Plymouth) part number: "Cylinder water outlet elbow" is listed as 375950. Different from the 30-U and the PB.

I was under the impression that the PA and PB engines were pretty similar so it might be that a PB water outlet elbow would fit a PA. Since the numbers are different the parts must be different but maybe one could be made to work.

[Tailspin]

I am looking for the flanged housing located on the forward end of the engine head.  This housing is where the upper radiator hose is attached!   Does anyone know of a source or alternate part that could be modified to work?