Once I removed the OEM center speaker, I realized it was in a fairly deep hole. Tweeters sound best when they're as far up as possible so I didn't want to just set the tweeter in the bottom of the cavity. I happened to have a perfectly sized rubber stopper on-hand so I mounted the tweeter mount to the top of the rubber stopper. This would allow me to securely mount the tweeter in the center cavity, but have it up near the top of the dashboard for the best sound.