Id almost be inlcined to go over there to see the guy and the car. If plugs and wires will shut him up change them and at the very least it's shown you've tried to make him happy. If the headliner bow flipped after his guy inspected it maybe find out how much it would cost to deal with that for him. If the bumper has issues tough s*!t. He can blame the guy who inspected it for him.
If this guy is a hot head ignoring him might make him start talking to an attorney.
I wouldn’t. You start giving him things that implies warranty.
I would simply say, you bought, you get both halves if it breaks in half.
Leave me alone or deal with my lawyer if it comes to that.
Everyone who sells stuff has “ that” customer. The other 99% are fine. Don’t give them oxygen to bug you
