Wiseco Top End Bearing for Pol Trailboss 350 ATV 400 LT250 ATV &gt; ENGINE &gt; Piston Rings Clips & Bearings &gt; Replacement Circlips/Wristpin/Bearing Application: 18x23x24 Caged Needle Bearing Wiseco Piston Replacement Circlips/Wristpin/Bearing B1002.