You would need to remove the arm rests from the two buckets. Then you would need to pull the carpet up and see if the holes are there for the center seat. If so, get a used one, or a used 3-there is no bench, it's 3 separate seats, from ebay, craigslist, etc. and bolt them up. If there is no bolt holes, then that is a separate deal and will involve welding, etc.