Set 3x cross arm rollers for Porsche 924 944 968 power window linkage

Power windows that are getting on in years become sluggish and sometimes stutter. This is often due to the worn rollers that are clipped onto the ends of the cross arms. They are worn, sometimes stuck and then no longer roll along the bottom edge of the window. Some of the rollers have also broken off completely. They are not available individually from Porsche and so far there has been no alternative but to look for a slightly better, used but still expensive window regulator. This set of three rollers can be used to replace a window regulator (left or right). The rollers are made from a durable thermoplastic material.