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No idea on the width or info on the swap.
I think it is 60.5 at the widest.BTW the 88-98 trucks were narrower then the 73-87...
I measured up a 2002 seat and if your 4'8" and no beer gut it would be ok....lol...from what I could tell there is not alot of the seat bracket that comes off the newer seat to get is sitting low enough.I love the idea of the jump seat though and if I could find a cheap set I would certainly give it a shot but since they sell for 300-450 thats a little much to pay for something that might not be comfortable (sitting too high)
If you do happen to do it please post some pictures when you get it done...thx