When I was taking the pictures, I first looked in the passenger side and the stairstep wasn't there so I was thinking that the vent door was just held up by friction. Fortunately, I looked at the driver's side and found the stairstep! Also on the door I presume that there was originally a strap the stopped the door from opening up too far. I don't have anything on my doors and am not sure what they would have looked like.