http://i246.photobucket.com/albums/gg115/BackYardSoundZ/1998MustangGTRed.jpg

Does anybody know how to remove that molding piece?

TTT

I did this recently for my 2000 GT, and I think it's the same set of steps. If not, hopefully it's close enough to help you out.

I had to take out the weatherstripping along the roof and that exposesabout 4-6 screws that attach the roof rail moulding. On my 2000, I had to take out the weatherstrip running to get access to these. Once you have that stuff off you are good to go.