This bearing is used in all Polaris RZR 900 and 1000 models that use a trailing arm. The bearing in your trailing arms are constantly being abused and put the test and so they wear out quickly. Replace them before they do damage to your trailing arms and leave you stranded. This bearing is also designed to reduce vibration and noise that can happen with the stock bearing. Made of steel with a super smooth Teflon inner coating designed to last longer then stock. Sold as a PAIR. Exact replacement for Polaris part number 3514689. Fits either left or right side. Fir the following RZRs: 2011-14 RZR 900 (Including 4 seater) 2014-20 RZR 1000 XP (Including 4 seater) 2016-20 RZR Turbo (Including 4 seater) 2018-20 RS1