did a quick search on google and found a supplier with the following discription... not linking due to non sponsor site
may seem to fit?Group Gasket for Gaggia Espresso Machines
70mm (OD) x 56mm (ID) x 8.5mm (T)
Compatible with Gaggia Classic, Baby, Baby Class, Baby Twin, Espresso, Evolution, Carezza, Cubika,
Fits all Gaggia Traditional Espresso machines except for the Gran Gaggia, Espresso Pure, & Espresso Color.