Sierra International U Joint Assembly For MerCruiser Bravo I/Ii/III 0B664190 & Up 18-6401. The assembly kit contains: (1) 18-2146 Yoke (2) 18-2174 U-Joint Cross and Bearings (Heavy Duty) (1) 18-2128 Center Socket (1) 18-6400 Yoke (1) 18-7117 O-Ring and...