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Not sure on 68 but in 67 LOS didn't use hidden VIN's. I beleive that 68 didn't either.Buddy
I asked this same question a couple of years ago concerning my Sequoia Green car. When I took everything off of the firewall during the most recent restoration (there have been a few of them over the past 27 years), there was body color on the firewall. Things like the blower box, master cylinder, accelerator rod bracket, etc. did not have black paint under them. I repainted it green and did not use any blackout. It may not be correct, but as near as I could tell at the time, that's the way it was when it left the factory.