Hey OldGyrene, would really love to see an outdoor pic of your tailgate. I'm working on a '65 rebuild and based on the link below and dracko's screen shot above it looks like your PPG WA5123 and Ditzler 43276 should be the same. However, your tailgate looks so much bluer than his pics.
http://paintref.com/cgi-bin/colorcod...=Chevy%20Truck