Hey Guys, Great Site! I am currently hunting down front seats with folding jump from a 1999-2004 Silverado/Sierra to put in my 1966 L/B stepside. I will keep you guys posted on the progress. The seats look like they will fit. If they don't I have a big crow bar and a sledge hammer
I almost did something like that to my '65, but some of those seats are hard to come by because they had the seatbelts built in, so they were never (at least back in 2000 when I was doing it) removed from a good truck. You could find them in wrecked trucks, but those usually had glass and crap in them. But I did a ton of research and a pair of buckets with a console should fit in there quite nicely.
I just purchased a 1990 bench seat (chevy) with the "tuck away" fold down armrest. ($100 cdn) It is very comfortable especially for the middle person. I hope it fits or maybe I could borrow your hammer and crow bar! however I do like the integrated seatbelts in the 2002 which went for $250 CDN for a set up here! GOOD LUCk!!