Unavailble from MINI at the moment
BMW MINI OEM Piston Rings for a R53 Cooper S 2002-2006.
A great thing to replace to refresh your engine, will require appropriate running in of the engine with mineral oil for ~500 miles.
Comes as a set for 1 piston, i.e top ring, second ring, oil controll rings. You will require a set of 4 for one complete engine.