Does anyone know casting number for '36 Ser 40 Third Member Housing?

[Krugie36]

I would like to know the casting number of the 1936 Ser 40 Buick third member housing. If anyone can give me that information, I would appreciate it. The number 1295957 is cast on the right side of the differential housing area on a 1937 S40 housing, but I'm not sure if it would be in the same place on a '36 S40. If you have a housing that has the number above, then you have a '37 setup. I have a feeling that many '36 S40 Buicks have had there drive trains replaced with '37 setups because the ring & pinion gears are more robust than the '36 gears.

I want the number for the '36 so that I can verify that I purchase the correct housing. Thanks for any help.

Les