In my '82 F150 ext. cab the previous owner had changed the bench for two captains chairs and a center console.... The passenger seat had no bolts, the console had two self tapping screws, and the driver side was barely held in by two bolts on the outside bracket.... O.o
Anyway I'll look around and see if I can find something that'll be of use to you.
This thread should help you a bit.
It seems that Bronco bucket seats fit well, you just need to add some holes and bolts in the right spot. But I don't have any experience with this.