La Pavoni Stradivari Chrome Base since circa 2017 with 3 mounting hole. This base does NOT work for pre 3 holes style Stradivari machines, (note that the 3 hole are not pictured here but they are present.) NOTES: To remove the old base, you’ll need to remove the Heating Element, and you should replace the gasket when reinstalling it (P-7ss for stainless steel elements). If the spacers above and below your current base are no longer in good shape, they’ll need to be replaced as well (each machines uses two). P-4E is for the smaller 8-cup boiler, and P-4P is for the larger 16-cup boiler. Some Pavoni base screws have a Torx head, which came in two different sizes. Please see “you might need” parts below.