I did have to grind away some of the Challenger cluster body where the alignment pins for the lens' are on the outer upper left and right corners of the cluster.
Also had to grind away some material on the back side of the Rallye Bezel where the Cluster was a little larger than the space...
I used the cluster as my mold, applied some clear shelf contact paper (Vinyl) as my release agent and to protect the lens while working on it.