I have found that the rear screen on my 93 WRX is leaking on the drivers side. This has caused the parcel shelf and seat to become wet. After removing the seats and trim from inside I performed the old hosepipe trick but found very little. On closer inspection outside, there appears to be a small gap at the bottom of the window. I plan to take off the exterior trim and fill the hole with a good quality sealant. Does anyone know if the exterior trim is just for cosmetic purposes or it actually holds the window in place? If it can be removed how is the best way to remove it? Thanks, Mark