Just replying to remind that the ones that had the jump seats installed came with a re-enforced rear bumper for safety. I don't use mine anymore, my kids have outgrown them, but because they reinforced the bumper, removing them for sale will depreciate the value more than selling them separately.
I've read a lot about looking in junk yards for Tesla parts like this.
There's also two kinds, mine have the leather and cloth while the newer ones are just cloth and seem flimsy.