I ran into this same problem recently with our Ventura. The paint shop had an old interior paint chip book and a color code for the interior green (Medium Green 42901LH), but Dupont isn't made anymore. The spectrophotometer tool couldn't match the color with a high percentage either. We ended up going through the stand alone Axalta paint chip books (which is apparently what Dupont became) to find something close. Even then, it what was mixed came out different than the chip. You might have to get creative.
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Ken
'68 GTO - 464 - Ram Air II heads - 236/242 roller - 9.5” TSP converter - Moser 3.55 Truetrac ( build thread | walk around)
'74 Ventura 350
'69 AMC Javelin SST
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