Skip your guesses are correct. All BSF of course. 
A= 34mm. B= 3/8". Stud protrudes 7/8" (mine goes on side armour) 
If you make the collar as high as the lowest point of the sides (make sense?) you will be pretty close.
		 
		
		
		
		
		
		
			
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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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