I just bought a whole bunch of Diode Dynamics bulbs for mine. License plate, rear turn signal, backup and trunk light.
They are kind of expensive, but they are very good bulbs. And they are white, not the "white" (see blue in dictionary) that a lot of places sell.
I really like them and am probably going to add more in the future.
I think one of the huge benefits to their lights is that they are enclosed instead of raw LEDs like some of the cheapies.
Nissan 370z LED and HID Lighting