CTD 600 and 600 CTD are in the regular pool of plates issued in AZ and are not available as custom plates, so I got this instead. After the novelity of the 600 wears off, I think this will be better anyway.
I did see a truck this weekend that has a cool Cummins 600 badge on the rear fender panel on each side. It was some kind of sticky and was nicely done.