Malossi Piston Skirt ID#s MALOSSI PISTON TECH INFO Skirt# - Piston #1201 - 3490552957 - 3484462958 - 3478492959 - 3481802980 - 3486543009 - 3485443010 - 3485423595 - 3416448 w/13mm Pin3595 - 3416930 w/12mm Pin3389 - 3413047 w/12mm Pin3389 - 3413034 w/13mm Pin