Humminbird 740182-1 AD MTM HW MSI Trolling Motor Adapter. Overview: MEGA SI+ Trolling Motor Transducer Adapter Bracket converts a MEGA Side Imaging+ transom mount transducer for trolling motor use. With a rugged composite design, it conforms to the trolling motor for a low profile fit. Compatible Units: Compatible Transducers: XM 9 HW MSI T, XTM 9 HW MSI T, XM 14 HW MSI T, XTM 14 HW MSI T. Compatible Fish Finders: HELIX 8 CHIRP MEGA SI+ GPS G3N, HELIX 9 CHIRP MEGA SI+ GPS G3N, HELIX 10 CHIRP MEGA SI+ GPS G3N, HELIX 12 CHIRP MEGA SI+ GPS G3N, SOLIX 10 CHIRP MEGA SI+ GPS G2, SOLIX 12 CHIRP MEGA SI+ GPS G2, SOLIX 15 CHIRP MEGA SI+ GPS G2