Tread slowly replacements are not the same as oem specs make sure the floor and rails are sealed where the old screws penetrated. Drill new holes in different places and grind off any burrs smooth use rtv sealer everywhere measure twice before ordering and work with your vendor, preferably the original mfgr secure seat floor and rails with aluminum screws and washers again sand/grind off any burrs installation is quick.
I had the same problem when I updated my 1985 Harris FloteBote. The pontoon manufacturer isn't necessarily the company that built the seats so most of the time they cannot help you as they don't have inventory to match, most pontoon boats are built to order. The nice thing about a pontoon boat is that you have a lot of freedom messing around with the interior.
I ended up replacing the deck and carpet as ours had soft spots on it and then changed out of the seats, we bought everything from PontoonStuff.com. In the process I spaced our railing out an extra 2 inches so I could fit a larger seating arrangement inside. Good luck and have a blast doing it!
I bought my pontoon seats from PontoonStuff. Com (spoke with Annette and she was great! ).
Most of the help and information about restoring my pontoon came from PontoonBoatForum. Com and you can see my pontoon restoration there by searching for Mr.Diesel.
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