1、Wide Application: SSR HD hub kit is for use on 200 to 400 hp 4 Stroke outboards with 1.25in propeller shafts, suitable for MerCruiser Bravo One XR KZ. 2、OE Replacement Number: The part number for reference are 8M0101601, 8M0101603, please confirm whether it is consistent with the OE you need. 3、Improve Shift Noise: SSR HD hub kit helps prevent gear shift noise and propeller rattle, resulting in a quieter and smoother transfer of engine power to the propeller. 4、Reduce Vibration: The SSR HD propeller hub system designed to reduce vibration on high horsepower outboards, reduces vibration by 25% during gearshifts 5、Durable Construction: Made with copper and rubber materials, the kit assembly is built to last. It is resistant to wear and tear, ensuring long lasting performance even in harsh marine conditions.