What's the reason for this guys the bar at the bottom of the door and the slot in the chassis ,is it some sort of stiffer to make the body more ridged ?
How ya John.
First-is that the original colour on your car? It looks like a pearly, metallic orange colour in pics?
Anyways , it's sometimes referred to a a "nader pin"
afaik
It's connected to a reinforcement bar in the door.as the doors are frameless I guess they were weak in a side impact or rear impact.