FT Bearings, 8x16x5 mm This item fits the following: Pro4 SC10 RC8B3 RC8B3.1 RC8B3.1e RC8B3.2 RC8B3.2e RC8B3e RC8T3 RC8T3.1 RC8T3.1e RC8T3.2 RC8T3.2e RC8T3e RIVAL MT10 This part fits the following other parts: ASC80926 - RC8B3 and RC8B3e Kit Bundle ASC81077 - FT Aluminum Rear Hubs ASC81078 - FT Rear Hub Inserts