Exactly what happened to mine, but at least I cut the back steel to use for my rust bath.
https://i.imgur.com/h8o6AxH.jpg
https://i.imgur.com/s9JFNnM.jpg
The seat belt is build inside and no way of reaching it. If people get theirs past the point and locked in, I can see somebody wanting spare seats, but thats providing you have the space to keep them for a long time until the potential buyer comes in....I didn't