how bad is it corroded? i've changed a fed corroded ones and i've noticed that the actual clamp itself was corroded but the cable part of the connector wasn't so all I would have to do is unbolt what's left of the clamp and just replace that.
with that said, i usually grab some clamps at the junk yard.
what i did see in the auto parts store is something like this
http://www.f1soundgallery.co.uk/prod...1131549409.jpg
which looks like would work also if the condition isn't that bad.
but yea, its on my friend's galant, not mine since my optima red doesn't give me problems like that.