What window related part is this?

[Beehanger]

What window related part is this?

Pulled the drivers side panel off to grease the window rolling mechanism. Found this at the bottom of the interior of the door.

What is it? How important?

 

[mcmlxxxv]

Missing picture ?

 

[Beehanger]

What window related part is this?

Pulled the drivers side panel off to grease the window rolling mechanism. Found this at the bottom of the interior of the door.

What is it? How important?

Missing picture ?

****
thanks.

 

[Skniper]

That’s the rubber bump stop/cushion from the door limiter arm. They get old, crack and break off inside the door.