Thanks to Tony Gricar.

For those of you wanting to upgrade your factory front speakers, one upgrade is to a 6 1/2" component speaker (separate woofer and tweeter). The problem I'm addressing is how to hide the tweeters.

To place the tweeter in a less visible area, which can be a problem as most people don't want a 1/2" protrusion on their door, a great place is to add it into the corner of your windows. The black, triangular plastic piece that is in the front corner (a-pillar?) that has one screw in the middle of it. If you drill a hole in this for the speaker wire, you can mount the tweeter to this. It makes the tweeter practically invisible. Terrific stealth when viewed from the outside of the car.

Preserving the factory look is essential to protecting your investment.