I have these used transducers for sale. The GT30 is transom mount for downscan and sidescan. The GT8HW-IH is a glue in hull for 2D sonar. The Y cable connects them to the unit. I had them on a 93SV, but they will work with other Garmin Chirp units. Will only sell as a package. I can text pics. $200. TYD
This setup is the way you can use a glue in transducer on the SV series. The all-in-one transducer that comes with the units will not work with a glue in transducer.