Sierra International 18-2699 Outdrive Kit The Sierra 18-2699 Outdrive Kit is interchangeable with the following: Mallory 9-62606. Contains: (1) 18-2996 Outdrive Seal, (2) 18-7153 O-Ring. Sierra Outdrive Kit Contains: (1) 18-2996 Outdrive Seal, (2) 18-7153 O-Ring Sierra part number: 18-2699 Interchangeable with the following: Mallory 9-62606 Use with 18-3721 Stainless Steel Locknut