Welcome, nice looking SC. Seating has a lot of options. Unlikely you will be able to find exact replacements. Re upholstering might be the closest you will get. I went with a modification to suit my needs and you can spend a little or a lot. Start with Iboats, without them this site would not exist.
I had back-to-back (loungers) in my Jupiter and liked them. http://i176.photobucket.com/albums/w200/ezmobee/Boat Project/DSCF1928.jpg the 10" bases will be a little high for your boat. Might have to figure a way to cut them down or fabricate new bases. Mine were Wise seats that were BassPro branded and I think they were quite decent for the price.