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I have the same boat. Use a 2×10…you’ll thank me later
X2
I just replaced the bench seating in my old 14″ alumnacraft and I used regular 2X10 board. The biggest problem I had is that the brackets that attached the board to the side of the boat were designed for a 1 inch board and the bracket sandwiched the board, so it sat both on the top and bottom of the board. To fit a 2″ board, i cut a clearance slot with a skill saw in the ends of my boards so that the top bracket would slide into the board. Then I liberally coated the raw wood with some leftover deck sealer.