Eaton Supercharger Coupler

made in USA

Eaton black OEM couplers are made from MolyGard

heat stabilized, internally lubricated, 30% glass-reinforced nylon (not a cheap coupler)

Not a generic or aftermarket made in China

  This is the original coupler found new supercharger in your GM Supercharger.

The local dealer and the parts stores don't carry them.  Eaton is the brand of supercharger that comes stock on your factory GM, Chevrolet, Buick, Pontiac etc... Supercharger 

If your car has a rattle and it's coming from the supercharger, most likely this little part will repair your problem.  Have you tried bringing it to the dealer?  They usually give you a $2500 estimate and tell you that you need an entire brand new supercharger installed because they cannot order this part.  They have to buy the entire supercharger.