When I purchased my truck it didn't have the backup camera installed. I've been reading the forums and it appears to be fairly simple to install, but I'm having some problems finding the right camera.

Truck in question: 2010 FX4 Screw with Nav

I've found these 2 part numbers:
9L3z19G490b
9L3z19G490c

I called my local shop and they really couldn't tell me what the difference between the two are. Just curious to know if anyone else has ran into this issue and may know which is the correct part for the 2010 trucks.

Thanks