I have a set of never used rear facing jump seats out of my 2013 Model S. Nuts and bolts to install, but no reinforcement or mounting hardware other than what’s attached to the seats (meaning you will have to buy the parts at approx. $250 not including the reinforcement. I am in the East Bay of the Bay Area, CA. I took them out to utilize the under trunk space and they are now in my garage ready to go in the next car! $1,200.
Chris
Chris