Fuel Injector 557-7634 Compatible for Caterpillar CAT Engine C-9 C9 Tractor D6R D6RXL D6T D7R D7RXRFuel Injector 4W 7020 for Caterpillar CAT Engine 3412 3412B 3412C 3408B 3408C 3408 Generator SR4 Condition: New Part Note: For the new part, we advise you replace the whole set together, Because the oil output and atomization concentration of Genuine and parts are different, they cannot be mixed to work for the same engine. ReplacePartNumber: 4W 7020, 0R 8791, 4W7020, 0R8791, CA4W7020, CA0R8791 Fit for Caterpillar CAT Engine: 3412, 3412B, 3412C,