I believe this is for a Montego GT drip rail molding. It is brand new. I took it out of the packaging. Not perfect, but it's still very nice.
I think the part number is d2gy6520833a
I'm sure this will only fit a GT as the MX had a slightly different roof line. At one time I did have both the GT and the MX though. So please look at images closely. The part numbers were on there when I got it. I've had it for about 8 years now
Will ship for $30