Remove the seat. Spilt it right down the center useing a jig saw or other reciprocating saw. Once you have done this you can create wood replacement. Then use the two halves of the original bench as end caps and remount the bench. Attach the ends of the original to the wood and then reinstal...
I have always had good luck with the ones you can buy at wal-mart (Atwood Tsunami). The more GPH (gallons per hour) the faster it will drain yer boat. I think they are about $20 for 500 GPH. Good luck.
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Yeah, it kind of snowballed on me. When I first became a police officer my chief found out that I had worked for Camp Fire Boys & Girls so he volunteered me to go to DARE instructor school and then teach it in the schools. That transpired into a couple of other instructor certifications and then...