Connecting 2 Bose Zones to a new receiver (1 Viewer)

My current audio system has an old Bose System and (3) Additional Bose Amplifiers. I know the limitations of the bose systems, but I do recognized that the possibility of controlling up to 14 zones is really good.... I would like to upgrade my home theather room installing either an Onkyo or Yamaha Receiver and use Mirage, Klipsch or Pioneer Speakers. QUESTION: How can I connect the additional 3 rooms (Bose Amplifiers) to a 3 Multizone Receiver. Considering that Bose use different types of cables.?
THANKS,Carlos

Some Bose systems have RCA AUX input...
So, which of the Bose systems made since the 80s do you have?