MINI Factory Replacement Belt Tensioner Assembly for the Cooper S.
Fits the following Mini Cooper S models:
2002-2006 R53 MINI Cooper S Hatchback
2005-2008 R52 MINI Cooper S Convertible
This tensioner assembly keeps tension on the serpentine belt to prevent slippage on the different components driven by the belt.
For the Cooper S Belt Tensioner Tool, see NME5990.