Top seal is from vendor A and the bottom is from Studebaker Parts. They share the same "GSK051" vendor part number. I have only seen this number used by Studebaker Parts
This the seal package from a vendor that does not repackage and uses the original Best Gasket packaging.
Here is the package for a McCord NOS seal
The top seal in identical to the Best Gasket seal, Studebaker Parts, and Studebaker International AND vendor A. This seal has no markings and has a impregnated fabric strip for sealing. The bottom seal is the McCord seal. It is marked with "Brummer" molded into the rim along with the Studebaker part number "531326" and "STUDEBAKER"