Jen,
I just found mine after searchin the web for one. Remove window cover on light - press in on both sides - there are 2 screws under that - remove them.
Turn over head there are 2 plastic like clips on each side that you need to press in on using a screw driver or force the sides out to clear them - it is marked on the outer rubber if you look carefully.  Gentley seporate the top from the bottom from back to front.  It will snap as it releases from the front - be careful not to break anything.  You are in - be gentle removing the bar.  Goods luck!
Warren
                
 Warren
                
 March 2007