In you other pic of the back of your boat - what's that yellow looking tubing over your shaft. I installed a drivedog and joint and it came with these little gromets that are too small to go over the bone and I don't know where they go. I sure they are to help it from sliping out but I can't figure it out. I'm thinking of using something like that yellow tubing to go over both joints to keep the presure on it so the bone doesn't fall out - what is that and what should I use?

I'm attaching a pic of the back of the boat and let me know where you think I should attach the fins because the back is different from any boat I have.