Sierra 18-2748 Mercruiser 4 Upper Exhaust Boot Sierra high-quality engine parts are designed to meet OEM specifications. For use on Mercruiser Stern Drive engines. Upper Tube 4 Fits MCM 120, 140 GM V-6 V-8 engines Use with 18-1975-1 Riser with Exhaust Tube Interchangeable with GLM 89120 Mallory 9-72805 Mercruiser Stern Drive 32-44348T 32-44348001 32-44348 California Residents WARNING Cancer and Reproductive Harm - P65Warnings.ca.gov Other Details Google Product Type Engine Parts Wiser Yes Prod