Oh, I kind of doubt it has been covered.
There is a search.
I think that - by far - your best bet is to speak personally with somebody at Axiom via phone. If Brent, JC, Ian, Andrew, Debbie, et. al. can't help you, nobody can. You'd need - at minimum - the Thiele/Small parameters of the original woofer to know about the suitability of any replacement.
Is it possible to perhaps just replace the speaker surround? Sometimes even if the surround is shot, you can still rehabilitate the driver and reuse the cone and motor. How bad is it?
Edit: Sorry, Socketman. I was composing while you posted