Outlaw Racing OR3077BK Chain Roller Guide 43x28mm Black KDX 175 250 400 420 Part fits both Upper AND Lower or varying models, please contact us for assistance finding the correct bearing. Designed as a direct replacement for the OEM design. Where Applicable rollers feature an outer mechanical seal to protect the bearings from dirt and water and include mounting hardware. SIZE: 43x28mm. This chain roller comes in BLACK.