Photo 10 for Folding Canoe Seat Oak With Cane Seat And Back 2 Available

Hi, Possibly interested but would need a couple measurements to know if it would work with my canoe. I have a Wenonah. What is the length of the slot along the side that would fit over the existing seat in the canoe? Also, what is the height of that slot at the front end of the chair where it would go above and below the existing canoe seat?