Bought a Gaggia Classic last week and saw this bottomless portafilter (right) online. However it doesn't seem to fit, the fins at the side (not sure if that's the right word?) are
Semi-Automatic Perfect Crema Filter Kit - Whole Latte Love
Gaggia classic portafilter
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Gaggia Classic RI8161 Coffee Machine with Professional Filter Holder - – Videoly demo shop
Bottomless filter holder for Gaggia 58 mm espresso machines, walnut handle, 21 g sieve, 3 cups : Amazon.de: Home & Kitchen
Buy Gaggia Classic Portafilter Filterholder with double 14g. pressurized basket (21000491) & Spout Online in Vietnam. B07NL9Y3Z7