If you pull the carpet up, you'll probably find the seat mounts for buckets are already installed in your floor. There would be no change in the seat belt mounts. It's only a matter of taking a trip to your local boneyards and finding seats that fit.
See if the Boneyard guys can look up the seats in the Hollander interchange manual; I can't remember if seats are included in the manual, but the salvage folks can likely provide guidance. Sometimes you can identify the years of seats that fit, and then go get them for yourself at a U-Pick yard.