I have seen this on a few AU Falcons. Luckily mine seems fine. When you say yours has come off is it the part thats at the top of the rear window where it joins to the rear door opening or is it the part near the boot.
If the rubber seal isn't destorted it should just slide back in place and perhaps us abit of electrical tape around the window edge to stop it from comming off again.
Motor May 2001 Quote: "Believe it or not, there are actually a bunch of weirdos out there who reckon a six cylinder is the dux gutz. Bugger it: I'm one of them" :s5
AUII Late Ed XR6 HP T5 Venom- Full Tickford Body Kit, 17in Wheels, Herrod Bi-plane Spoiler, Momo Steer/Gear, T-Series Interior Options, Premium Stereo and a very light-tuned 4.0L I6
(FPV-Tickford Club of NSW Member and Co-Founding Member of 3FB Inc, Ford Forums Food Bandits)