1Part Number: According to the original factory specifications, replacing rOEM numbers are 90121HN1000, 90305GE8003, 52101HP1000. 2Applicable Model: Swing arm pivot bolt nut fit for TRX450R 20042009, fit for TRX450ER 20062014 , and fit for TRX400EX 19992008. 3Firm Fixing: This is the big bolt that goes through the frame and holds the swingarm onto the frame, includes bolt, nut and washer. 4High Quality Material: Swing arm bolt nut is made of heavy duty metal and ABS material, high hardness, wear resistant and durable. 5Perfect Fit: Premium quality replacement parts, stable characteristics, high reliability, direct replacement, no modifications necessary. Item Type: Swing Arm BoltMaterial: ABS + metalReplacement OEM Numbers: 90121-HN1-000 and 90305-GE8-003, 52101-HP1-000Fitment:ForTRX450R2004-2009ForTRX450ER2006-2014ForTRX400EX1999-2008 1 x Swing ArmBolt