There are quite a few different grenade boxes. 
There are the "square" ended ones, and the ones with the cut off corners. 
Each of those two types comes with bolt holes in the base, or bolt holes in the back. I think they all have different part numbers? 
I have two NOS boxes that are not drilled. 
Maurice, there should be a part number somewhere. 
 
There is more to be found on these if you search "grenade boxes"
		 
		
		
		
		
		
		
			
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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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