We wanted to use nice PPG stuff so we actually started with a color that was originally designed as a SAAB green. It was close in hue (and had a similar flake), we mixed in black till it was right (took several spray out tests). We had buffed out one of the original highland green headlight buckets to a shine and used it to match. I feel its pretty close to the factory HG for 68.
I can get an actual formula if anyone is interested.
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