Thought I would jump down here and give you guys a link. I just bought a very straight 61 GMC from this guy and he has mainly trucks 34-55 year range, from full restorables to parts trucks. From what I have been told his inventory is massive. Price on my truck was very decent so I assume these would all be the same. Next time I talk to him I plan to find out if he has a 51 GMC for my collection. Dont know if this is any help to any of you, I just know how hard these old trucks are to find.
http://www.nex-tech.com/FreeClassifi...183426&cpage=7