Sierra 18-3937 Standard Piston Ring SetSierra high-quality marine parts are engineered to meet OEM specifications. All pistons are supplied complete with piston rings and wrist pin. Standard size; For us on Mercruiser Stern Drive, OMC Inboard, OMC Stern Drive, and Volvo Penta engines; Interchangeable with: GM; 14089025; Johnson/Evinrude Outboard; 328506; 986336; 3853960; Mercruiser Stern Drive; FI1101321; FI1100692; F3892364; F328506; FI1100386; 39-34988; 39-67123; 39-65153; 39-17464; OMC Inboard; 328506; OMC Stern Drive; 985083; 328506; 3853960; 3853268; 986336; 914555; 3853268; 14089025; 0986336; 3853930; Volvo Penta; 3853960; 3853268; 856381;