Indeed, rare...!!!
Reminds me of the time one of Joe Alexander's friends (I won't mention him by name, but those who know Joe, know of this friend) took me on a drive in his 1962 220 Cabriolet with rear bucket seats, and we went to one of his old warehouses somewhere in a not so nice neighborhood in the inner city of Columbus, Ohio. We went looking for a couple of OEM (not black) windshield wiper arms for my car (which we found) but he had shelves of all old parts from about every MB imaginable. One of the gems was the entire wood dash assembly from some 1950s era MB...for a RHD car. Probably shipped in error to the USA dealer, and this friend was in the habit of buying up old stock from old dealers and hoarding it.
Anyway, looking for a price? What's the price of the LHD unit? Add 20% and see where it goes...