Is the passenger seat power or manual? Did the shaft end break off with the handle (#9) or (#11)?
If so, that is only serviced as an adjuster assembly (#6) or seatback assembly (#1).
The Sebring/200/Avenger from 2007-2014 will work.
Manual seat:
Power seat (drivers side shown). The handle on the seatback (#14) is serviced with the seatback (#1).
The 200/Avenger seatback frame from 2012-2014 will work.
Most salvage yards will sell you the complete seat instead of seat parts: