I looked at that part on my '08 XC70.

it certainly looks like a separate part, held on by two clips at the rear door edge.

I'll bet that you remove it by opening the door and window and push the part toward the rear of the door.

It looks like you install it by sliding it back on - there may be tabs and slots in front to hold the front tight - check for slots at the top and bottom. The clips at the rear are to add friction to hold the part in place.

If the clips are damaged, you may need new ones.

Procedure 1. Install the piece with the window open. Put some dish soap on the entire seal, and on the window to help the window slip up the first time.

Procedure 2. Install with window closed. MAKE SURE THS RUBBER SEAL IN THE FRONT IS FLAT BEFORE YOU PUSH IT ALL THE WAY ON. Put some dish soap on the entire seal, and on the window to help the seal slip over the glass

As for its name - the B pillar would be the part of the body that remains after both doors are open. How about - Front door, rear of window trim?

See my other post.

Ask a dealer - you will find out if it can be replaced and what the worst case scenario as far as price goes.

Then ask a junk yard to get the part for you - many include removal with the price.

Then you might see how it goes on the car.

How old is your son? Is he apt to do the same thing again?

If he is older, leaving it as is may provide an on-going lesson on the cost of doing something stupid.

Just don't mention it - he will see it over and over.

Hello Ken

It is usually referred to as the 'B Pillar'.

It may not be replaceable if it is an integral part of the bodywork. If a panelbeater (or even a 'Dent Doctor' type of operator) can get behind it he may be able to remove the dent.

Cheers