300$ Boat Project: Seat replacement issues

Since I picked this boat up I have been beating my head trying to figure out how I'm remove the seat bolts to change them. Wifey came out while we were doing carpet when I brought the subject up. I went through the speil of all the ways I can't get the bolts. After all that she reaches over and flips the seat up on it's hinge and says "these bolts?". I wondered why there was a tub crammed under passenger seat. Not sure how I missed the fact they were mounted on hinges. ugh!

Images here

 

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