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NICHE Driveshaft Kit Part Number: MK1001263 Includes: Driveshaft Coupler Differential, Driveshaft Coupler Engine Known Brand Compatibility: Yamaha Direct Replacement For: 5KM-45593-00-00, 5KM-67839-00-00, 5KM-67839-01-00, 99999-03630-00 This Part is known to be Compatible with the following vehicles: Yamaha Grizzly 660: 2003-2008 Front Differential Driveshaft Coupler and Front Engine Driveshaft Coupler. The Front Differential Driveshaft Coupler replaces the Coupler which connects the Front Drive Shaft and the Differential. The Front Engine Driveshaft Coupler replaces the Coupler which connects the Engine with the Drive Shaft. This Couplers are made from forged steel to ensure it stays in your vehicle longer. The splines are also chemically hardened and then heat treated to resist wear better than the OEM. Quality and performance guaranteed.