Grouphead Gasket La Marzocco 6mm 72x55x6/8mm Fits: All current La Marzocco models such as: Linea, FB70, FB80, GB5, GS3, and Mistral. This Grouphead gasket is the thinnest one, used on newer machines with no wear to moderate wear on the groups and portafilters. NOTE: if your machine is older or the groove and the portafilter wings are worn out you might want to order instead the 11887