The best seats are the 90-93 buckets. I have a set of those. I also have a set of 91 van seats.
I put Rancharger seats in my 78 D100. They made 2 different Ramcharger bases. Short and tall ones. I used the tall ones. I had 2 sets so I made it so both seats tilt forward and slide adjust. I had these in my CC for years and is the reason I did that but I put them in my 78 standard cab this year. I can't slide them all the way back because they hit the rear window. Not a problem with all the floor room.
I'll look at my van seats but I think they would work just fine in a truck.