I actually cut a hole out in the speaker grill. With the tweeters that I got they matched the grill perfectly... You can see pics on my cardomain. However for sound... Not the right place. I am currently creating kick pods for my 5.25"s and creating a gauge pod sort of thing for my tweeters on the pillar...
I know some of the MB Quarts will install as co-ax or component, but that far behind the grill will not help the sound. Mounting on the grill, or using the map pocket seems to be popular choices. They also give some of the best imaging.
j/k... Here's how I did it. I belive Sir Will did his as well, and may have more to add.
I removed the door panel, and cut out the back of the pocket itself. Take some cardboard, ad mock-up the piece that will be going in. Trim a bit at a time until the fit is perfect. Take your time here. It WILL pay off later.
I then traced that onto some 1/8 particle board. It's flexible and paintable. Glued it in place, and mounted the tweeter onto that. The woofer is on 3/4 MDF using the original plastic speaker mount as a template. Then cut the hole using your speaker template on that. Paint and mount.
The whole job will take an afternoon. But, IMO, it's well worth it.
Oh- my crossover fit behind the panel, your mileage may vary.
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