The Sierra 18-2772-1 Transom Seal Kit contains the following: 18-1074 Exhaust Bellows, 18-2100 Gimbal Bearing, 18-2765 U-Joint Bellows, 18-2996 Outdrive Seal, 18-715 O-Ring, 18-710-64-2 Hose Clamp, 18-710-48-2 Hose Clamp. Interchangeable with the following part number: Mallory 9-72931.