Hi gros21,
(http://limbatus.net/linked/tm/LTT-post-picture-001.jpg) (http://limbatus.net/linked/xl/LTT-post-picture-001.jpg)
The transducer is about 6 inches long and three inches wide. If the Lowrance SI transducer fits and gets decent returns, I guess the HB would too. Probably depends on what you'll be using it for. Hull movement might be a concern if you're looking for detailed scans. I use a towfish when I'm out in the canoe ...
(http://limbatus.net/linked/LTT-JR-tm-picture-002.jpg) (http://limbatus.net/linked/LTT-JR-xl-picture-002.jpg) ... (http://limbatus.net/linked/LTT-JR-tm-picture-003.jpg) (http://limbatus.net/linked/LTT-JR-xl-picture-003.jpg)
Hope that helps,
Darrell