David: 
Thanks for the images. 
I realize I am probably wrong as the owner has very specifically indicated it is an "L" version and he must know more than I do. 
 
The key issue was the lack of a true "side view" to try to gauge the wheelbase.  As well, in Bart's book, he says that the "S" versions were later upgraded to 10:50x16 wheels which would certainly give the "S" version a completely different appearance. 
 
Maybe, at my age, it is just something Freudian about "long versus short" 
 
I do not seem to have in my collection a picture of an "S" version with the larger wheels so the whole question may well be moot. 
Cheers 
Bill
		 
		
		
		
		
		
		
			
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