Hi guys.
I've given the car a wash today and in the process i've found one of the wind deflectors to be cracked. It's a nice neat crack that's not overly visible, but as soon as the power washer touched it, it was enough to separate the offending parts.
Now.. on my Vectra the deflectors are simply fitted inside the window closure aperture.. but not on the Impreza, so how do they come apart and how difficult are they to replace?
I can probably get away with gluing the crack easy enough.. but prefer to do it properly if it's not to bad too do. Don't want to go forcing anything and make it worse otherwise.

Thanks.