Hi George 
 
To help answer some of your questions. 
 
#1  The sprockets with the "lip" all around are earlier ones.  The later carriers seem to have just been flat plate that the sprocket was cut out of. 
 
#2  On the MK1 Carriers the exhaust cover on the L.S. was solid with asbestos pad due to the tarp resting on it.  The R.S. cover only needed a grill as nothing was sitting on it.  On a Mk2, I believe the way the tarp is folded around the stowage bin, it would make both ends of the tarp resting on the exhaust covers. 
 
Hope it helps some.
		 
		
		
		
		
		
		
			
				__________________ 
				Jordan Baker 
RHLI Museum, 
Otter LRC 
C15A-Wire3, 1944 
Willys MB, 1942 
10cwt Canadian trailer
			 
		
		
		
		
		
	
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