If that's bent, it's not much bent.
but I've had the issue before, with Shimano 105 caliper brakes
from the late 1980's, where the bolt down the middle ended up bent. My local shop had an extra sitting around. But such pieces are rare, and I imagine they're more rare with Campy.
It's probably less trouble (and perhaps less cost) to just replace the front brake. If you're really wedded to Campy, I have a Veloce (dual-pivot) front brake I could sell you.
If you're really wedded to this exact brake, well... good luck.