ABS Sensor. Air Flow Sensor. Vehicle Note-2: For Chevrolet Silverado 3500 HD & GMC Sierra 3500 HD fits the model without Dual Rear Wheels (DRW). Vehicle Note-1: For Chevrolet Silverado 3500 HD & GMC Sierra 3500 HD fits the model with Extended Cab Pickup or Standard Cab Pickup, doesn't fit.
