Don't think you can get one new repro or NOS anymore. Maybe a good used one.
The ones sold by Centerline, Classic Alfa, Alfaholics etc are the euro type.
The Spica one has a return hose pipe that you need to fabricate or take off your old one.
Think they also have baffles inside.
Thanks guys. I located a Spica fuel tank which I as told was made for both the GTV and the spider. It comes with a short neck at the tank and a rubber neck that has to be cut and installed with clamps. My guy is installing now. He did tell me it needed further modification .