I do not have the part number. But it probably wouldn't help since I think it came out of an Allroad I had years ago. I tend to hold onto the nets when I sell/trade cars and have a few different ones on hand.

 

Perhaps. The set up I described and photographed is ideal for carrying items in the cargo compartment. The lip at the perimeter of the Weathertech mat is somewhat pliable. If you carry larger items (requiring the seats to be folded down) which extend beyond the lip of the Weathertech mat, the lip will bend, twist, or compress under the weight of the load. The lip will return to form when the load is lifted. The bending, twisting or compressing of the lip, however, may allow liquid (or sand or dirt) to leave the mat, which may or may not be relevant or matter.

 

When the rear seats are down, they are not quite flat. That little angle takes care of any squishing problem with the front of the added rear mat.