Okay, thanks for the replies.
Now, seeing how this is a panel truck, did they still have the same set of front seats like that, or did they use a regular truck seat? Wait, you might have already answered that question with your comments about the seat riser. Show us a picture of your seats and seat riser.
The passenger seat, does just the back hinge forward, or does the whole seat hinge forward, like in new minivans for easy access, and to haul long items with the rear doors shut? If it s the panel style, it was optional, some did not come with the passenger seat. If it did come with the seat it would be a bucket style similar to the drivers side except it flip forward and the drivers seat has a slider. If it has the suburban style seat, it would be a 60/40-70/30 type seat. The drivers side is fixed on a slider and the passer side is a flip seat that goes all the way against the dash.
Do allot of folks just stick pick up seats in? I have seen pickup seats used, but they are difficult to get behind or allow passengers to get into the back area, not a problem if you don't transport more people than the front seat can hold. Or do most people not lose the front seats somehow? Hahaha. Bucket seats from later model cars and trucks are commonly used in these panels.