To my surprise, there were no tweeters in my original OEM driver setup, evn though I remember I have seen in some manual there suppose to be even in the basic config.

Fortunately there was space in the door behind the black grills that you can see when looking towards the outside mirrors.

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X5 3.0d - Space Grey , Beige Leather, Burl Walnut Trim, SatNav, Rear Camera, Sunroof, Light Package, 19" 212 Wheels, Tint, Power Fold-in Mirrors. AUDIO: Morel Elate 6 Audiophile Speaker System with Genesis Dual Mono Amp and Rockford Fosgate 3Sixty.2 DSP