a97 mfd and e66020 transducer

I have recently installed new electronics an a97 and a95 mfd's quantum radar; an E22158 st adapter and a transducer adapter cable for an existing e66020 transducer (fish finder, speed, temp). My question is that when I go to the transducer selection page it gives a large list of transducers to choose from. None of them is an exact match for the above mentioned transducer, how should I select, I have tried several and they all appear to work. Also will all functions work (temp and speed)?

Second question, is there a new transducer that could replace the e66 using the existing fairing?

Thanks,
Phil