I'm assuming you're trying to get a close match with components already on the bike, so as mentioned, your best bet on specific models would be to ask in the C&V forum.

I'd be looking a lot on e-bay also. If you're not trying to match a specific groupset it shouldn't take too long to find Campy brakes with aero levers.

edit...Just out of curiosity, I checked E-bay, pulled up "Campagnolo brakes" and there were lots of listing of what you're looking for.

Being Campy, get ready to pay.