SD-TEC clutch friction plate for 4mm deep spline clutch hubs (used as original beginning ~1989) is both bonded and riveted for maximum strength, smooth engagement, and durability. We have been offering these clutch plates since 2008 with excellent results. This clutch plate is a substitute for all original deep spline clutch plates including oem numbers 03084401, 05084430, 03084410 and 03084400, 29084450. From Stein-Dinse in Germany. These plates are currently running approximately 8.3mm thick, which is a little bit thicker than the 8.0mm normal thickness.