Here are some links and asome more info. Telenav
has what you are actually asking about. It's a goosenek holder that mounts to the windshield with a suction cup. It is on their Accessories page. I just went there and it asked for my phone number and PIN. I have and account, so not sure if you can just go in to buy the holder since they primarily sell direction services.
The ProClip dash mount (easy install) can be found at ProClips
. You will deed a device holder and a vehicle mount. They're not cheap, but they are real nice.