I just bought an '08 extended van and intend to install the ventshade visors over the two front side windows, like I have with my last 3 vans. Having the vents allows me to leave the windows cracked open a bit to let the heat out while I'm parked somewhere, and nobody can see the windows down with the visors covering the top of the windows.
I usually get the in-channel vents, but I'm having trouble finding them. The stick-on type are available, in chrome even, but I think I remember a post somewhere saying don't bother with the stick-on type since they will fall off and probably disappear.
The other issue is that the product application charts don't go up to '08, which is when Ford changed the styling of their vans. Do you suppose the front window channel size/shape has changed?