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20R1277 Cat 3520, 3508 Fuel Injector 7633978944 0131746000 Genuine Freightliner Alt Pulley20R1277 Cat 3520, 3508 Fuel Injector This Cat 20R1277 fuel injector is built for select Cat 3520, 3508, 3512, and 3516 applications. Specifications Brand Caterpillar Part Type Fuel Injector Part Numbers 20R1277, 392 0216, 11R 0682 Weight 10. 0 lb Engine Fitment 3520, 3508, 3512, and 3516 Application Part Type Fuel Injector Core Charge No core charge. Contact us if you would like to sell your core. Fitment Note: A matching part number can fit