The HDI skimmer transducer is the way to go, if you get a new transducer. It give awesome 2d and down imaging shots. I have used it on a gen 2 touch 9 for the last couple years and been very happy. I had the lowrance plastic transducer shield the first year. While moving the transducer to a new trolling motor I noticed the lowrance cover was cracked where the hose clamp passed through. I ordered the Transducer shield and save version and like it better. More money though.