My 5 cents worth.....
			 
			 
			
		
		
		
			
			Based on our expereince at the Barn....All the clips are the same ...some in leather some in rubber dipped. 
 
The difference is the bracket used to install them in CMP.... in gun tractors they were mounted with out the vertical 1/4 inch brackets. 
 
In the cab 11/12 they are mounted using a shorter bracket to take into account the fact that the back wall of a cab 11/12 is taller than a cab 13.  On the short back wall of the cab 13 the mounting bracket is almost twice as tall.  Both are mounted with 3 screws on the cab11/12 and two screws on the cab 13.... I mean flat head machine screws 1/4 20. 
 
UC were no doubt using the same spring clip but may have used a different bracket to suit the UC features. 
 
Cheers
		 
		
		
		
		
		
		
			
				__________________ 
				Bob Carriere....B.T.B 
C15a Cab 11 
Hammond, Ontario 
Canada
			 
		
		
		
		
		
	
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