This has been interesting. PPG responded to me that the original PPG number for Healey code GN 29 was 43217, although they say the code is obsolete. However, further research contradicts that.
www.minimania.com site shows that Ditzler/PPG number 43217 was for the 1963 BRG (the more yellow color). The MG color guide at
www.teglerizer.com/mgcolors site shows dark BRG GN29 has an ICI # 9767 & a Ditz # 46446, DUP 8194. The autocolorlibrary.com site shows a Ditzler # 43217 as the lighter BRG, but they have different # 43342 for the darker shade. I am beginning to think that our friend Mr. LUCAS, when not busy fouling up our electrical systems, must have got into the car painting business. He was probably mixing some BRG paint one day and accidently dumped an extra pint of yellow into the BRG batch, making GN 25. Never able to duplicate that color again, he just left the extra yellow out of BRG starting in 1964. I am planning to use PPG paint, so I hope they can find the right mix for ICI 9767, as that is what I will go with.
Personally I prefer the lighter shade, but want to repaint the car to the correct shade of GN 29. However, if I become even more confused over the color shades than I already am, my Healey may turn out Ferrari red.