I do not recognize either of those units. I suspect they may have been custom jobs from one of the Scandinavian manufacturers, like SEAS, Vifa, etc. You might want to contact them. It is a long shot. The problem is we know nothing about the specs and T/S parameters of those units.
Unfortunately trying to retrofit different units is almost always a lost cause.
If the exact units can not be obtained then unfortunately you have a useless pair of speakers.
Did the seller disclose that those two units were not working? If not contact eBay to get your money back from the seller.
Lastly, those are active speakers. How do you know the problem is not with the electronics? It is far more likely that the problem lies with the active amps or crossovers than the drivers. This is a complex device and you will have to find a qualified service center. This is not something you will fix.
Unlike Shady, I have never held B & O in high regard. In my view they have produced weird 'avant garde" gear that despite the hype does not sound very good.