I lost a seat back two years ago driving back from the lake. I noticed when I put the boat away that most of the screws holding the new seat backs on had fallen out, I really don't want to lose another seat back. Not sure what is behind the seats but definitely metal under the carpeting. I have tried pre-drilling holes with a small bit but have broken more bits than I can count so that is some tough metal.
My question is: How thick is that metal and how much space is there between it and the gas tank?
I was thinking of either using a self tapping sheet metal screw or figure out how to remove that panel and bolt the seat backs on