I removed the dealership AC from a brat to put in another (will not see the other for a while) and I thought the non-AC brats had a box/duct with a vacuum actuated flap to cover/uncover the fresh air inlet. My brat now has an opening for outside air and if this item exists I wanted to install it to control fresh air/recirculation. If so does any one have a picture of the item for some friends who are looking for this for me?