[Jeff n Susan]

I installed them on our 330. If you are mechanically inclined, they are not hard to do. The first one was a bit intimidating because of the unknown, but the second one was a breeze.
When raising the slide, it only needs to go up just far enough to slide the ski in, I would say about 1/8". Any further it would be easy enough to cause some damage to things you don't want damaged!
I seald mine with silicone sealer along the screw rail. They have been in place 2 years now with no problems at all. Good luck!