Your best bet is to find a local body shop to match the paint if they can....if they have a gold leftover, they will often do it cheaply.
The problem is that the bike is over 40 years old. Even if they made that paint in a touch up size container, it wouldn't match because of age. Agood body shop can mix up a small batch that will match much closer.
If the tank is in good condition, the right way to do it is to have the tank and side covers repainted, and have the painter leave some aside for touch up.
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