Sierra 18-1973 Exhaust Manifold Riser

• 2 1/2 in. Exhaust Riser
• 90 degree down angle
• Fits most early model 120HP Mercrusier applications
• Replaces Mercruiser 55538A2
• Replaces osco 5538

Replacement for Mercruiser part #'s 55538; 39920; etc. Used on 4 cyl and Inline 6 cyl Engines only. Includes all pipe plugs and mounting gasket. 3 Year Warranty. NOTE:Replaces OEM part # MERCURY MARINE 55538A2 For: most early Model 120 HP Mercruiser applications Use with Manifolds: 18-1954-1; 18-1955-1; 18-1956-1 Elbow Gasket 18-2833 Mounting Kit: 18-8508