Some Seafarers have small screws spaced along the bottom edge as well as the clips, mine came without the combing pads so I made them from scratch and just use the pull up clips but remove them regularly when not in use
Look on the bottom side of the pads and you will see a brass grommet every few inches. With a Phillips screwdriver you can feel around and find a screw to remove in each grommet. When they are all out pull straight up and the pad will come off. That's how mine are fastened.
Halfhitch has your answer. The sit on J hooks and fixed with S/S screws when you put your screwdriver through the grommets point it upwards to located the screws.
Yep. Just did mine on my Marlin. Enough material and all tools required were around $550 for the bolsters, aft seat and companion seat. Prob half that for just the bolsters. If interested in doing it yourself see the thread in the Tips forum. The bolsters are fairly easy to do. Seats a little tricky.