This is a front bearing from Boca Bearings designed to fit the O.S. MAX .21 RG, VZ-B and VZ-B V-Spec, RB Concepts WS7, WS7II, Novarossi P5, P5X, 421B, Pllus 21-5 and 528XR off-road competition engines. This bearing will also fit any other .21 to .28 competition buggy or truck engine that uses the same bearing dimensions. This is a Chrome, High Performance Rubber Seals, Polymite Retainer, C3 Fit bearing. The bearing dimensions are 7mm inner, 19mm outer and 6mm thick. This bearing is sealed to stop fuel leaking out the front of the engine during use.
Some of these bearings may have two seals. If you only wish to have one seal, you can remove the seal from the side that will be inside the engine.