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I have a 2015 150 SS. Here is a photo of my transducer installation. The board I used was one of the commercially available plastic lumbers for marine use. There's a few brands. I believe the stern saver is nothing more than this same type of material, already cut to size. I made mine to fit the boat, not the transducer, because I was using an inherited transducer which might not have been a permanent addition to the boat. I GLUED the board to the boat with 3M 5200. My install was in the winter, so I misted the area and kept it warm with a light bulb while curing. The material is the thicker stuff ... 3/8"?? Maybe 1/2". So, my screws are shorter than the material is thick. What I wanted was to avoid piercing the hull. Stern Saver is supposed to be nice and look good. Good luck!!!

https://photos.app.goo.gl/SGMgUqDhn5Z...hn5ZlozNF2