Different carburetors were used on the Aurelia including Solexes and Webers. Information will be added over time. On the early B20s, two single barrel Webers were used, 32 DRSP 7. The last number refers mostly to the mounting flange, which could be square or diamond shaped. Other versions, such as 32 DRSP 3 and 10, were used on other Italian car engines, and their interior parts are interchangeable. Sometimes one finds small variations in the tops of the carbs, which doesn't really matter.
The 2.5 liter motors used the Weber two barrel 40DCZ and DCL carburetor, the difference being mostly in the metal casting material. Nardi typically used two of these mounted to his manifold, changing their jetting. Below are Weber's tech'l sheets on the DRSP (Ital and English) and the DCZ carbs, with some detail shots of the explanation and use of the DRSP's "Economy-Super-Aspiration" choke device, or as they call it: E.S.A. If you have one of these, its worth reading, as the operation is not quite as you would expect.
English copies are thanks to Paul Mayo <email@example.com>and his workshop manual, recommended to all Aurelia owners.