Any of these below would work.
If you plan on real deep (over 100′) then maybe consider a 50/200-KHZ frequesncy.
Most use the 83/200-KHZ
Lowrance HS-WSBL Skimmer Transducer
Product # 106-72
Lowrance Shoot-Thru-Hull Transducer
Product # 106-89
These are Lowrance product numbers but can easily be cross referenced. Maybe try JollyAnn marine, a IDO Sponsorer.