i installed two pairs of chrome trimmed Audiobahn AT67 tweeters (quite the beauty) in the top of the door between the door handle and the outermost dash vent (to the left of the instrument panel on the driver side; right of glove box on passenger side).

sounds good as hell from there--screams at you just like I like it. but yes, it IS in plain view AND i've already had one break-in.

but yes, in the dash my '97 EX had stock tweets. they were mounted to the speaker cover and just slid into place up there. I suppose if you had a small enought tweeter, you could just go to a junk yard and pop those speaker covers out the front dash. I believe the speaker covers were a tad bit to the outside of the vents you're referring to.

how you gonna wire tweets into the dash if stock wiring isn't already available