Metal Diff Oudrive Cups for increased durability.Fits all versions of the Blackzon Slyder and Slyder Turbo.Recommended upgrade when using the Steel Driveshafts:#540067 - Metal CVD Front Driveshafts (2pcs)#540068 - Metal Rear Dogbones (2pcs)Genuine BlackZon kit spare part for quick repairs, correct maintenance, and precise fitting.