OK, narrows it down, sadly probably makes it harder to find too as all the newer options, Punto, Cinq/Sei, and newer Unos will be wrong. Easy enough to spot, the injected ones all go down to a single outlet at the base, whereas the one you have will have a twin outlet with the downpipe merging down behind the sump. If you can find one a carbed Uno Fire one should be fine but that's about the only other thing that carried the Fire engine pre injection (Y10, but little to no chance of seeing one of those, and the Tipo had a 1.1 in Europe but I don't think we got that here)
Not got a spare I'm afraid but I hope that helps with the hunt.