First of all, Welcome to the CEG.
I have looked at the 2 cars very closely, and It seems as if it will fit. The mystique grill just comes forward a bit more. I am so confident with this I already put my order in for the new body kit in the group buy section. Pretty much every mod for the contour works on the 'stiques as well.

98 Black Mystique; Duratec/ATX
"Mystique, the luxury SVT"

P.S. This is what part of the alphabet would look like if the letters Q and R were omitted...