The manual indicates the Sonar beam is 200kHz ...
If the Wide Eye transducer connector is the house shaped #9 - 7pin connector - any of the HB xducers xducers capable of 200kHz will work ...
If the Wide Eye transducer connector is the older 6 or 2 pin connectors - all of those xducers are discontinued ...
Have you checked eBay?
Rickie