Buy Caterpillar 7M6239 - SHIM at wholesale prices with easy payment and fast shipping options. Save up to 50% OFF OEM pricing. Compatible Machines:Compatible Models:Units Containing The Spare Part :- 7M6255 DECELERATOR GROUP--Field Installation--Type 1 (977A)- 7M6255 DECELERATOR GROUP--Field Installation--Type 2 (977A)- 7M6255 DECELERATOR GROUP--Field Installation--Type 3 (977A)