Sully Transducer Brackets for Outboard Motors | Bass Pro Shops
Here is a link to Basspro maybe this will work for you. I have spent all day trying to figure out how to put a retractable one on my boat. I just bought a new 798 SI HD and I don't want to put it on my trolling motor as I hit stumps ever now and then and it breaks off. A new transducer for my unit is $180.00 and I don't want to replace it. I just replaced a transducer for my 788C. As soon as I get one built I will post pictures.