GOLD Label™ Poly Rib Heavy Duty Belt (5081260) by Dayco®. Lenght: 126″. The Dayco Gold Label™ serpentine belt is a diesel grade belt that features higher performance construction over conventional light duty belts in order to meet the high torque and power pulses exerted by today’s demanding diesel engines. The specially treated cords within the belt resist stretching and ensure the length stability that is essential for drive systems on high output diesel and gas engines.