Acme Lombardini carburetor parts

[freedomlives]

My Goldoni has an LA490 motor. The rubber boot thing, under which is a fuel filter insert, leaks horribly. Anyone know a part number or even better name that rubber thing is called in Italian so I can find a spare part over here in Europe?
Going to try another temporary fix...

 

[ptsg]

This manual has the breakdown of the carburetor parts in Italian. Hopefully it helps. https://iservice.lombardini.it/documents/ProdCateg/2140/MO_LA_400_490_510_IT_HD.pdf

And this website has some parts for those engines: :: Technidiscount :: Vente de pièces détachées moteurs en ligne