New Old Stock Mercury 767-9140A3 Pistons and Pins. Good set of pistons and pins for a Merc 25XS. No rings or clips. Stamped into the top of each piston is P7-1-18 or P7-1-13 both are 2.56 inch diameter. No scratches but they are a little dusty. Sold as a set and shipped in a USPS Medium Flat Rate Box.