There's a guy on Pirate that modified the back of his CJ7 to fit a full size bench seat, might be worth looking into for you.
I think I've seen it. Is it called the cj7 stretch? I think he's using a third row seat from a suburban witch I have one of those. I did look into it some. But with the racing seats and jr dragster 5 point harnesses they won't have to use car seats. I hate car seats for wheelin cause they bounce all over the place. But yeah it's a good idea. Thanks for the input.