Yes they were bolt on and the seat slides so much easier than the plastic slide. I usually just leave the slide on and remove the seat so it fits under my tonneau cover.
x2 what Glenn D wrote. On my third otter and haven’t had that problem…yet. Only issue I have is that I have to make sure I sit center or left of center in my pro cottage or it tips sideways, either that or have something in the tub on that side that makes it seem like I have lost about 20 pounds.