This it the stock air filter for the Dellorto SHA style carburetor. It will work on the SHA 14.9, 14.12, 14.14, 15.15, 16.16.
This filter is found commonly on Italian Peds, and Tomos bikes with the Dellorto carb.
This will not work on the Vespa moped SHA. You will need an airbox of some sort in order to keep this in place.