Kent,
Supposedly, many original trucks came from the factory with "custom" paint jobs. As long as standard-option colors were ordered, there might not have been an extra charge. My guess is that it is possible fenders could be factory-painted as any standard color.
Go with what you like. If anyone asks, just say you matched the colors/combinations that you found on your original truck.
Pin striping would probably refer to that body/belt stripe and possibly wheel stripe/stripes?
Good luck - please post photos of your progress.
