1965 thru 1966 is when the laws changed requiring amber parking lights.
The S/Cs were sold from 1965 thru 1967.
Early cars had white lenses. Manufacturers changed to amber bulbs under white lenses until stock was depleted, and then began using amber lenses.
If you are replicating a Comp or early S/C, use white lens...
...a late S/C, use amber lens.