have u looked at seats in a 240sx......I got some parts off a 240 in a junk yard that fit my 84.....and the seats look simular...I would think that Nissan was smart enough to design seat bolt patterns on a standardize method for assembly...just a thought
What you should do is find someone that's selling nice seats. And instead of paying for him to ship the whole seats, have him cut the fabric off and send it to you. It should be fairly easy and will save you hundreds in shipping.
There is just a bunch of stupid clips that need to be cut off, on the back and the bottom.
Buy yourself a big pack of zipties, and some spray on adhesive, and you can go from this: