If you want generic USB port like that I think you need to solder some parts in the connector. There is a big thread in these forums with pics of how to do it.

If you don't mind a dedicated charger, I bought a motorola microusb charger and it works great with my N900. It charges at a higher rate too, which is important. Lots of the generic 500mA usb car chargers don't put out enough power to charge.

This is the one I use:
http://www.amazon.com/dp/B000S5Q9CA