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				 I'll throw in an opinion... 
 
			
			I think it has started life as a panel van, or more likely a K-51 ( that's one of those odd cases where they built a batch of vans, then contractor-converted more of them to K-51 than they left as plain panels, so plain panel vans now rarer)
 Reasonably certain it was never a bomb tractor, as it is the longer standard wheelbase ( unless someone has stretched it ) instead they have cut off most of the body, split the cab rear centre, and pushed the back corners apart, then filled in the gap - not uncommon where you wanted to widen the cab to take a three person seat.  Hinging screen has been taken out and lobbed / welded / glued back in.
 
 Zero chance of finding a panel body pretty much anywhere.  If the mechanicals are intact, bin the cab and fit a standard GMC / Chev truck cab, keep the front metal, and buy a 1.5 ton standard Budd cargo body for it.
 
				__________________Gordon,   in Scotland
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