This listing is for a NEW OEM Sachs 1st oversize piston kit. Kit consists of piston, rings (already installed), pin and clips. The part number on the piston kit is 1486 029 016 and the vintage Polaris part number for this piston kit is 3006143.
According to my old parts book, this is for the SA280 single cylinder motors. Label says 71.5mm and 71.425 is marked on top of the piston.