Very nicely made reproductions (molds from originals). Obtainable from http://www.ferraricraft.com/2015/10/fiamm-air-filter-thumb-screws/
MANN, Part No.: P715, various suppliers. The rubber ring seal must be purchased separately.
Mike Pierce can rebuild any Weber to like new condition. He also carries many parts and his web site includes drawings and specifications for many of the carburetors used on vintage Lamborghinis.
Great source of all things Weber. They have kits for the 40DCOE for only $19.95. They also stock jets, filters, etc. for all our models.