This pair of new CV axles fit rear left & right on the 2006-2009 Yamaha Rhino 450 & 2004-2007 Yamaha Rhino 660 * Features stronger than OEM chromoly forged steel axle bars * Greased with a moly based grease to provide superior joint lubrication * Fitted with neoprene CV boots for added wear and puncture resistance * Compressed Length: left - 597 mm, right - 630 mm * inobard Spline Count: 39 (both) * outboard Spline Count: 27 (both) & Replaces Yamaha OE # 5UG-F531H-10-00, 5UG-F531H-11-00, 5UG-F53B0-20-00, 5UG-F53B0-21-00.