I think the website says "trolling motor mount bracket option" ... which I believe is just the normal tm bracket, that leaves the transducer sticking out away from the trolling motor ... and not necessarily the "sleeve" that I show in my pics.
If that's the case, I wouldn't purchase the transducer bracket (sleeve) from these same people. Their price of $33 is high ... you can get it off Amazon.com (from "Reds Gear") for $22 ---
Amazon.com: Buying Choices: Lowrance Trolling Motor DSI Transducer Adapter But, I would wait until you receive your unit, and check to see which "bracket" is included.