Hello, My Friends!
I just came here to tell about how I installed a pair of tweeters.
1. Get a pair of tweeters with an integrated case to embed it.
2. Remove the door cover in order to remove the mirror cover
3. Remove the little foam protection
4. Drill a pilot hole with a 1.5mm drill bit at the center (left/up side of the left/bottom square)
5. Just a check the center hole
6. Drill a hole with a hole saw or forstner bit (in my case, a 35mm)
7. Check if the diameter has a good fit
8. Remove all left materials
9. Confirm the fit
10. Lock the casing
11. Do it again to the left side
12. Connect the cables to the door speaker and cover it with some foam tape
13. Put the mirror cover back, checking if has a good fit and no cables are exposed
14. Very nice