Here's a pic of the brackets you'll need and how they fit on the car:
Most likely you'll have the one closest to the door, but you'll need the two brackets nearest to the transmission tunnel.
The back one
And the front one. Notice the brackets on top of the transmission tunnel for the console and shifter.... Here's a better pic:
and the holes in the floor that are tapped for the bolts to hold the shifter in:
and a pic of the hole in the floor for the console shifter cable
Your best option is to get a donor car with buckets or spend a couple hours at the scrap yard to drill out the spot welds all around the brackets, separate them from the car, and prep them to weld them in. Place your new bucket seat over the existing bracket that is in the car, and place the new brackets where they're supposed to go. Check the alignment of the seat to the front of the car, mark the outline of the bracket and then remove the seat again and weld in the new ones. Nobody will know that it wasn't factory.