For a mercruiser 2.5L/120 serial 2773308 (1968 to 1972)<br /><br />Does anyone know where I can buy these standard piston rings on-line or by telephone or know of an automotive set that will replace them?<br /><br />The sierra marine number is 18-3942 or alternative <br />39-67132<br /><br />Terry <br />Scotland
