Kevin. I think you will find these old fords used a special profile belt (as Richard has aluded to) I have an original belt here, Autolite 7RA 8620C the belt width is 17mm wide, but the depth is  13mm (a B section is 11mm) 
I think this will mean the angles of the side of the belts are different. 
 To do it right, you might have to go to the trouble of getting belts from a Ford dealer (e.g. Vanpelts in  the U.S)
		 
		
		
		
		
		
		
			
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				Bluebell 
 
Carrier Armoured O.P. No1 Mk3 W.  T84991 
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6. 
Dodge WC55. 37mm Gun Motor Carriage M6 
Jeep Mb #135668 
So many questions....
			 
		
		
		
		
		
	
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