Use a piece of cloth to secure the tweeters inside the hole. It will prevent them from rattling around.

Reconnect the car battery and turn on your favorite tunes. Use the fader to switch left-to-right as well as front-to-back and ensure all speakers are functioning correctly.

Adjust your fader. There's much more sound coming from the front of the car after installation.

The Infinity 10.9t tweeters were a bit too big for the recess, so I left them as you see in the picture. I did not put the factory covers nor anything else over them.