Sierra 18-5273 Mercruiser Tune Up Kit for V8 Thunderbolt HEI Ignitions Sierra high-quality engine parts are designed to meet OEM specifications. Fits GM V-8 engines with Thunderbolt IV V HEI ignitions. Voltage Regulator 18-5710 Kit Includes Rotor 18-5431 Distributor Cap 18-5395 Gasket Interchangeable with GLM 71780 Mercury 805759Q3 805759T3 Mallory 9-29350 Pro Marine 64759K Redline RL5273 California Residents WARNING Cancer and Reproductive Harm - P65Warnings.ca.gov Other Details Google Product