My newly acquired 1999 Z3 came with a wind deflector ( just like this one ) fitted, or shall I say "sort of fitted"

Can anyone please explain to me how this actually attaches to the car through those two round fittings? these two holes kind of line up with the hood cover attachment points behind the seats but there is nothing to fasten them to the car with. I also opened the roof for the first time today and found that I have to move these two round mounts on the wind deflector right out of the way in order to attach the hood cover which defeats the object ????
any help would be much appreciated
thanks

Can anyone please explain to me how this actually attaches to the car through those two round fittings? these two holes kind of line up with the hood cover attachment points behind the seats but there is nothing to fasten them to the car with. I also opened the roof for the first time today and found that I have to move these two round mounts on the wind deflector right out of the way in order to attach the hood cover which defeats the object ????
any help would be much appreciated
thanks