Sierra 18-5281 Tune-Up Kit - GM V-8 The Sierra 18-5281 Tune-Up Kit is interchangeable with the following: GLM 71810, Mallory 9-29308, Mercruiser 808483Q2. Contains: 18-5354 Distributor Cap, 18-5405 Rotor. Sierra Tune Up Kit Contains: 18-5354 Distributor Cap, 18-5405 Rotor Sierra part number: 18-5281 Interchangeable with the following: GLM 71810, Mallory 9-29308, Mercruiser 808483Q2 Fits 1996-2005 Indmar Monsoon, MCX, RPT and Hammerhead Engines