Jim Carter sells new Huck Drums (although I see you're looking for a 1 ton truck. I haven't looked to see if they carry any for those)
You may also contact this company for help:
Brake Materials & Parts Inc
Specializing in antique, vintage, classic, obsolete, unique and hard-to-find brake parts, bonding, riveting, rebuilding, drum and rotor machining, custom made brake hoses
800 Sherman Boulevard
Fort Wayne, IN 46808
260-426-3331
http://www.brakematerialsandparts.webs.com/