Yeah, you ARE the last person to know...... I was the second last!

Check my thread in the section on interiors. I was cutting the carpet for my van and made the same discovery as you just a couple of days ago. It seems they are the same as a wagon which has the fuel filler on the right hand side and gives the filler neck room.

Look in your van now and it's obvious that they are different, so why was it not before?