Do you have a jackplate on it? After careful consideration of all mounting options, I chose to mount my Structure Scan transducer on my jackplate. There is a kit available to do the job, made by Transducer Shield and Saver. They can be found here:
http://www.transducershieldandsaver.com/home/index.php?option=com_virtuemart&Itemid=82
I've used TS&S products before, and their stuff is top notch. I currently have their SSC-1 shield installed on my trolling motor and it works great.
However, I have a hole shot plate on mine, and I decided to save some cash and just manufacture my own wedge and mount system at home. Took me about an hour, including fabrication time. Mine works perfectly there, and is well protected.
All the best,
Glenn