Aftermarket sunroofs are a bad idea IMO.

First, the roof structure is different (at least in most vehicles, can't say for sure on the Contour) for sunroof/non-sunroof. The sunroof versions have to use different structural configurations to avoid the big hole designed in.

Also, it's quite common for aftermarket sunroof installations to leak and have other fitment problems.

As much as I would like a sunroof, this car will never have one. The risk/reward ratio is too high for me.