Jim Carter's used to list them, but I haven't had an updated catalog in a while.
Medium duty trucks changed from Huck to Bendix brakes in 1953. A later Bendix drum will not work on your Huck setup because the offsets are different. List a want ad in the swapmeet here. Some guys pull theses axles out and scrap them because nobody wants them. Finding a '53 or later complete rear axle might be a good move for better parts availability.
