Yak pretty much nailed it. I might add a tip, If you swap any parts around have both seats side by side, its easy to get screwed up as you have TWO sets of rails per seat. You need to access the screw heads through holes in the lower rails which need to be moved to the right position.(top when the seat is upside down on the workbench).

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"