I got a couple of messages regarding the fit of the spoiler. The only thing I had to do was use my heat gun to slightly form the spoiler to the lower valance of the Challenger. It was easy to form under a little heat. The tabs on the spoiler were in good spots to mount. I found absolute center on the spoiler and then on the valance and started from the center and worked my way out with a few mounting bolts. When I was done, there were no gaps and it looks pretty much factory.