Maxum Customer Care
The last I new the Maxum Customer Care support line is still open. It is really just Brunswick. They still have access to be able to cross-reference the Maxum part numbers. At least they did the last time I checked.
You should also be able to call a Bayliner parts counter. They may not be able to cross-reference numbers in the system, but if the person at the desk is half-way motivated, they can also call Bayliner customer support and get help. (Sometimes they are just lazy).