Local auto paint supply shop tried to duplicate the colour on my Black 914. It's a dark grey with Green metallic highlights. They did 4 test runs of what there computer scanner said it was and none were close. They finally dug out a old paint scanner from their old paint system and scanned the car with it. A exact match.
If the car is sun faded evenly it can be done. If it's uneven time to consider a complete paint job.
Good luck.
