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Hello Neebishisland and happy new year. The rear seat you are refering to in a Dauntless 15 is really a casting deck/platform which was part of the Sportman pkg.
The Sportman pkg. was a B/W option for our Dauntless 15's ('94 thru '98) which gave the weekend angler a few different deck accessory choices.
What some owners have done including myself is have a nice custom cushion made for this area. I have not come across a used casting deck yet but, that doesn't mean one might not turn up for you.
Check with Sue Lodal at Twin Cities Marine she might be able to help.
Good luck with your search...