I was looking at the roof of my car (2001 gt) tonight after i pulled into the gas station for a fill up and noticed that on the passenger side right above the rear quarter window there is a fair amount of rust visible. It is on the roof comming from under the trim piece that goes around the outside of the window. From what I can tell it is only on the passenger side...is this something I should be concerned about? or is it common for these cars to get rust here...any info would be greatly appreciated Thanks!!!