I'm using a pair of the rams on my 898SI. I don't know the size off hand, I'm guessing the small one is an inch, and the big one is around 2". I have them because I was in west marine & needed something that day, and it was all they had that would let me elevate the device. My console is small, and I needed to have it elevated to save space so the radio would fit underneath. It's been trouble free for 4 years I think, and it's had some decent poundings. 2 is probably overkill, but at the time it seemed like a good idea
