Check with Alretta Truck Parts.
I got adjusters for my 59 Viking. Had them on the shelf.
But he said they are hard to find nowdays. So I bought 2 sets.
Can Geoffrey at:
Alretta Truck Parts, Inc.
Bldg.#5B, 2nd floor
One Watson Place
Framingham, Ma. 01701
Tel# 508-788-9409
Fax# 508-788-9499
www.alretta.com