Aluminum Plate for MSC Clutch - backside is machined from premium Swiss 7075 T6 and also hardened with a black colored final area therapy. This lightweight slipper clutch dish has machined relief areas which decrease the friction area to help with clutch slip adjustment. Because of the brand new plate, the force associated with plate is on circumference of the clutch pads, which increases efficiency. Fits XB4'20-21