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soundman98 I would have went with the 3.5" Tectonic BMR for the dash, but all the 4ohm dealies are out of stock till summer. Seems you gravitate toward 8ohm speakers geared more toward custom cabinets for your cars. There is a sound quality reward for running higher resistance speakers?
As far as the mounting for that
1 x3" planar tweeter It looks like you can easily fabricate a gasket surround or a small riser to attach it behind a grill of some sort. This way it has all the air behind it to do what it need to do.. As long as the grill looks good. Or if you're fancy like the guy in the reviews you can buy 30 of them and spell out your name with it. I can make a LA Lakers logo using this and purple mounting plate. Just 1/4" thick it can be pretty dang flexible with mounting options.
But, that's all a waste if they dont sound good in the first place. I know what to expect with the traditional speaker. You look at these and think "wtf?". I"m curious, but I also dont wanna waste too much money experimenting either. lol