I was doing some work (replacing the Hydralock shock) on my Captain's chair on 1988 F311 SR-1 and I noticed that one or two bolts (that hold the seat to the pedestal) were not tight. It looks like the threaded inserts in chair rail itself were push out. I think the box rail on the chair is closed and I cannot get access to the bolt (to just put a nut on it) when the seat is inplace. Any suggestions?
Are they replaceable? I think they look like this:

I would need a pic of the seat. on my 292 they welded studs to the seats, then used nuts below to secure. of course the welds broke, but i was able to drill out what was left of it and just run a bolt up, with the lock nut on top. poor design. how is welding cheaper/faster than a bolt?

I would guess you could replace it, but more than likely it's just enlarged the original hole, and new one won't do anything anyway. Not unless you could get some epoxy or similar in there? Even then, I just don't feel like it's going to hold...

There are LOTS of threaded inserts similar to what you are showing.
Those are two very different examples though.
If the inserts are used in metal or sheet metal, they may be a clench nut nut just an insert.
Many varieties can be found through MIL-SPEC listings.
Again, if it is a nut pressed or squeezed into sheet metal, you may try doing a search for MIL-SPEC nuts for sheet metal, or MIL-SPEC threaded inserts for sheet metal.

Thanks, I was able to tie a nut with some light sewing thread and feed it through the hole...then seated/threaded the bolt. Took a little while but got it to work perfectly.

Congrats