The Rear Shock Bearing Adapter Upgrade Kits replace the standard DU bushing mount with bearing hardware. Designed to fit frames that use 8mm ID x 30mm wide hardware. Features Reduces friction to provide smooth, low-maintenance ride performance 23mm bearing adapter upgrade kit is compatible with Deluxe C1+(2023+), Super Deluxe B1+(2023+), SIDLuxe A1+(2021+) DAMPER BODY ONLY rear shocks. - Requires 22mm open-end-wrench for installation and removal 26mm bearing adapter upgrade kit is compatible with Super Deluxe Coil B1+ (2023+), Vivid Coil C1+(2025+), Vivid C1+(2024+) rear shocks. - Requires the Rear Shock Bearing Adapter Socket Tool for installation and removal DU bushing must be removed prior to installation. For instructions, refer to the relevant service manual.