I have had that same boat for about 5 years now. Run up down the Guadalupe. It's been a good boat. Now go get some of these, I put these on before I made the first trip. Have been in the boat for 8 hours at a time. Couldn't do that with those old hard plastic seats. Be glad you did. Same bolt pattern. https://www.walmart.com/ip/Attwood-Econo-Low-Back-Boat-Seat-Gray/16203727
If your near Academy check to see if they have any on clearance. I have two padded seats that paid $3.48 apiece for. This was right after I bought two plastic seats from them for $5 apiece at a different Academy store.