Used on wiper,stbd wi mercury 30,40,50 or 60 efi 4 stroke engine. 5.0" overall length 4.25" overall width 5 bolt hole quantity gasket gasket can be used iaw 30, 40, 50 or 60 hp 4 stroke mercury engine; material may be other than recorded; item is unusual rectangular shape with 5 bolt holes non-circular