WMW Supercharger Belt Damper Bushings. This is a great addition for your MINI. With the stock damper over time the rubber bushings will wear out and fall apart. If you get oil on them from a leaky valve cover or motor mount it will wear out even quicker.  When they wear out the tensioner can come apart and leave you stranded. Before this kit your only choice was to buy a complete tensioner at $260+. Replace them before it's too late. 

 

Kit is 4 peices. enough for 1 MINI damper

 

Look at the picture of the tensioner with shock, you'll see how the stock bushing came apart and the shock actually hit the crank pulley.