Shopping from Canada? 
Go to Defender Canada!
Garmin Heavy-Duty Transom Mount Bracket - 010-12006-11
Item: #1000548 | Part Number: 010-12006-11
The Garmin Heavy-Duty Transom Mount Bracket 010-12006-11 provides a secure, stable way to attach compatible 4-, 8-, or 12-pin transducers to your boat's transom. Designed for reliable sonar performance at all speeds, it includes a spray shield to reduce water spray and offers optional step mounting for adjustable transducer angle and reduced drag.
Garmin Heavy-Duty Transom Mount Bracket - 010-12006-11 Item # 1000548
Description
Easily attach your compatible 4-, 8- or 12-pin transducer to the transom of your boat with this mount that provides excellent sonar returns at all speeds. Since the transducer is in the water at all times, the mount does not protect the transducer from underwater obstructions and some drag on the boat will occur. The included transducer spray shield reduces excessive water spray from your compatible transducer when your boat is running at high speeds.
You also can mount the transducer to the step of your boat with this mount to allow angle adjustment of the transducer so it is parallel with the water surface; this will create no drag on the boat. And since the transducer is out of the water with this mounting style, sonar will not track bottom when the boat is on plane.