Many use Tahoe seats with the integrated seat belts. More modern truck seats usually bolt up too. I don't have a list to give you.
Summit sells some pretty nice seats that look good and don't cost big bucks. Used seats often smell bad, need upholstery or worse. Just saying.
I still have my original seat. I'm 5'10" and find I can barely be comfortable. In fact, I modified my steering column so it's closer to the dash. My arms feel more comfortable now.
People say that removing the tank from the cab gives them a few inches more leg room, but that's only true if you get a seat that will slide back into that opening. My original seat hits the back wall and the tank isn't in the way.
