So I went down to Rusty_TLC's house to help diagnose a noise/vibe on his '98 100-Series. First time driving it and I couldn't believe how far back the driver's seat will go. In fact it went so far back it was too far to reach the skinny pedal and I had to move it forward.
Mine OTOH, being a '99 FWTW, can't quite get back as far as I'd like.
We measured and measured and compared and compared but other than the 1.25" farther rearward adjustment with his '98 there were zero other clues where the measurement difference/additional rearward adjustability is coming from.
His is one of the very rare OEM cloth interiors. But other than that the seats, mounting brackets, position of the mounting brackets, etc. look the same.
I might have to swap seats out in the middle of the night after I get him good and liquored/rummed
up on our next off-road foray 
Mine OTOH, being a '99 FWTW, can't quite get back as far as I'd like.
We measured and measured and compared and compared but other than the 1.25" farther rearward adjustment with his '98 there were zero other clues where the measurement difference/additional rearward adjustability is coming from.
His is one of the very rare OEM cloth interiors. But other than that the seats, mounting brackets, position of the mounting brackets, etc. look the same.
I might have to swap seats out in the middle of the night after I get him good and liquored/rummed
had been driving.