Feature: 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. Specification: Item Type: Hub Kit AssemblyMaterial: Copper + rubber OE: 8M0101601, 8M0101603 Application: Heavy Duty 1 1/4in propshaft when installed on Racing 200XS, 225X, 2.5 EFI, 225 (Pro X, Pro XS, Sport XS), 250 (XS, Pro XS, Sport XS), 300 (X, XS), Sport Torq Master Gearcases (not Fleet Master) and for MerCruiser Bravo One XR KZ Maximum Horsepower: 450HP. Package List: 1 x HD Hub Kit Assembly (5pcs) Note: Please double check the part number of your item, matching information is for reference only.