Don't know if the code for a '74 GTS is similar; PPG 33199 - DK GRAY POLY.
It's still available from PPG - we had it test sprayed for Tim Hobleys '74 US GTS. It's black with a light gold-like metallic to it.
You can also get it from Carpaintonline.com as a acrylic based lacquer
Kristian
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