It's just the same as the normal unit but with a brass impellor instead of a plastic impeller. There are situations where the impeller can break on the shaft with the plastic impellers, the brass ones are far stronger.
I got it from the same place that did my belt and it is pretty common to use them on Fiat Coupes, so if you want one call Torque Italia (
www.torqueitalia.com) and he will sort one out. Fiat do not sell it, and you probably couldn't ask a Fiat dealer to use one. The uprated unit costs about ?40 I think (plus postage I guess), the Fiat one is closer to ?50 AFAIK!
Cheers
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