Why? If you've ever ridden in one you wouldn't have to ask. The original seats were cheap plastic contraptions that offered no support. Fitting something better is the first job you should do when you buy an SJ.
It is possible to fit seats from other cars, and many people do this. It usually requires some modification, from drilling new mounting holes in the seat base to welding on new support brackets. I tried this with a pair of seats from an XR2i. They provided much more support, but were too high (I couldn't see the traffic lights) and far too hard. In the end I settled for the easiest option, which was to fit a pair of front seats from a Spanish SJ. These are much more comfortable, adequate for most purposes and best of all they drop straight in.
If you ever carry passengers in the back you will need to think about replacing the rear bench seat too. It is possible to fit the rear seats from a Spanish SJ, but a little more work is required. First, remove the bench seat (four screws) and take off the petrol tank. Put the new seats in position, and secure the rear outer fixing hole of each seat with the existing screws. Then mark the positions of the inner fixing holes on the floor and drill a 6mm hole for each. Make up two rectangular plates to match the existing ones under the floor, drill and weld an M6 nut to the centre of each and weld under the floor to take the new mounting screws.
Mark the positions of the two front mounting holes for each seat, and drill 6mm holes though the floor and box section beneath. From under the car, enlarge the holes in the box section to 18mm to allow access with a socket. Then push an M6 bolt up through each hole and secure inside the car with washers and nyloc nuts (this is a two person job).
The rear mounting screws are much easier to use if they have wing nuts attached. I cut the hex head off each screw and welded a wing nut in its place.
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