In the late 60's (1967) , my first real job upon graduation was as a parts director in an MB dealership. As I recall, we would order these through MBNA and they would process and then send them to the owner to either install or just hold on to. It's been almost 45 years ago so perhaps an older original owner might recall. As memory (such as it is) may also recall, this was curtailed a few years later, much like the older cloisonne on brass mileage badges. Sadly, 1972 saw the demise of lots of tradition after that.