Finally we have replacement gaskets to offer! They are sold three gaskets and one filterplate to a pack - though if you clean the mokapot (which you must do to remove funky build-up) then you ought not need a new filterplate. But what the heck - that is how Bialetti is selling them nowadays.

These spare gaskets fit for the Bialetti Stainless Steel Moka Pots (Bialetti aluminum moka pots are sized differently) and might fit other brands too. The sizes are as follows:

*3 or 4 Tasse size:   outside dia. 2.5"; inside dia. 2"; thickness 1/8".
*6 Tasse size:    outside dia. 2 and 13/16ths"; inside dia. 2 and 3/16ths"; thickness 1/8".
*9 or 10 Tasse size:    outside dia. 3 and 3/8ths"; inside dia. 2 and 11/16ths"; thickness 3/16ths".