Try this site www.proclipusa.com I've purchased from them before and these are the best that I have seen for holding cell phones. The cost is a little on the high side for a mount but well worth it, no drilling required.
As advertised on their site - works great on the Z. I especially like the fact that if I ever change phones, all I need is a new adapter that pops on quickly to replace the existing one. Best of all, no marks on the car, it fits in between the plastic seams and holds nicely.
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