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Genuine OEM Torsion Coupler Jaguar Land Rover M112 Supercharger Isolator 8oz Oil

Genuine Eaton OEM 

Supercharger Torsion Coupler

Supercharger Oil

Not a generic or aftermarket.  This is the original brand and original style new supercharger coupler found in your Jaguar or Land Rover M112 Supercharger

Genuine Eaton OEM Supercharger Oil 8oz
Torsion Couplers work fantastic in M-series applications (the coupler is in the oil bath) absorbing shock and isolating the rotor pack from the pulley drive shaft.  Your bearings will last longer with this coupler!
If your car has a rattle and it's coming from the supercharger, most likely this little part will repair your problem

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