1. Fitment: Replacement for Cummins ISM CXU Series; Replacement for Mack MP7 MP8 Engine; Replacement for D11 D13 Engine.
2. OE Number: 21454379; 23669027; 21404578 are the reference part numbers. Please double check the part number of your item to ensure perfect fit.
3. Optimum Performance: The belt tensioner helps guide the serpentine belt on a car or truck engine. It restricts the belt from sliding and rotating between the engine's camshaft and crankshaft.
4. Perfect Fit: AC belt tensioner will fit effortlessly into the vehicle it was designed for so you can get started. Keep your vehicle running smoothly with this belt tensioner.
5. Durable Materials: The engine belt tensioner is made of very durable aluminum and rubber materials, so it won't stretch or wear out easily, with long lasting durability.

Spec:
Item Type: Engine Belt Tensioner
Material: Aluminum + rubber
OE: 21454379; 23669027; 21404578.
Fitment:
Replacement for Cummins ISM CXU Series. 09-11
Replacement for Mack MP7 CTP Series. 07-07
Replacement for Mack MP7 CXP Series. 07-13
Replacement for Mack MP7 CXU Series. 15-18
Replacement for Mack MP7 GU Series. 08-18
Replacement for Mack MP7 LEU Series. 07-13
Replacement for Mack MP7 LEU Series. 15-18
Replacement for Mack MP7 MRU Series. 07-11
Replacement for Mack MP7 MRU Series. 13-18
Replacement for Mack MP8 CHU Series. 07-18
Replacement for Mack MP8 CXU Series. 08-18
Replacement for Mack MP8 GU Series. 08-18
Replacement for Mack MP8 MRU Series. 07-07
Replacement for Mack MP8 MRU Series. 11-13
Replacement for Mack MP8 MRU Series. 15-18
Replacement for D11 VHD. 09-13
Replacement for D11 VN(VNL) Series. 07-18
Replacement for D13 VHD. 07-13
Replacement for D13 VN(VNL) Series. 07-18
Replacement for VE D13 VHD. 07-07
Vehicle compatibility are for REFERENCE ONLY.

Package List:
1 xEngine Belt