I put some 300zx seats in my 82zxt. They were definitely not a bolt-in fit. Passenger side was easy -- drilled a couple of new holes and bolted the 280zx rails to the 300zx seat, then it fit nicely. Couldn't do the same to the driver's seat because of the seat height adjustment mechanism. Ended up using the 300zx rails, drilling new holes, bending the rear of the left rail, and using a spacer under the rear of the right rail, if I remember correctly. The driver's seat mounted a little higher than the original seat, not too bad, but a bit too close to the bottom of the steering wheel. Later on, I installed a smaller steering wheel, and now I like the seat position.
Bill in San Diego