I had often wondered about that, because I have seen many different brackets on these cars, as well as none at all! Still, I am aware that my car's delivering dealer was one of the original M-B dealers set up in the 1950's, many of which were Studebaker Packard dealers as this one was. Studebaker was still delivering cars as late as 1966, although they all came from Canada after South Bend was shuttered. It wouldn't surprise me in the least to discover that my rear license plate bracket was a Studebaker piece straight from that dealer's parts department.