As we discussed in our emails, the JBL's are an inexpensive option when replacing the dash speakers. Short of going to a component system for the front of the car, they're the best bang for the buck. I promise you, you'll love 'em.
To my knowledge, no one has come up with a perfect-fit replacement speaker for the dash. Generally, all the major names (Infinity, Pioneer, Kenwood, et al) offer a 3 1/2" speaker, but they're simply too large to fit in the opening. DJKontakt was working on modifying the Infinity 3 1/2" speakers, but I don't think he ever posted his results.
As you can see in the attached photos, I manufactured a simple trim ring out of wood (painted black) that made for a nice fit. Other owners have found a way to fit the JBL's in a little deeper and have placed the stock grilles over them. I may go back and do that this spring. I'm sure placement has an effect on sound quality, so I'm hesitant to make any changes. They just sound so damn good to my ears. They've raised the sound stage slightly above the dash and add a clarity to the music that just wasn't there with the stock speakers.