I haven't a clue! I Googled this problem and came up with nothing. I did see this: I'd just have to get a handy set of tools, and get down on my prayer bones and attack the problem.
Take the passenger chair loose from the pedastal. There are 4 bolts and you can just lay it back. This would give you more working room. Then remove the pedastal, where bolts go through the floor. If you can reach the bolts that extend through the floor, do that first in order to save steps.
Good luck! So neat you got a chair given to you. We once took out a couch.. and although it was a bear to get to, we just found bolts and got them outa there.