try this link:
http://www.type-911.co.uk/images/general/codes.jpg
for early 80s SCs, it is showing the paint code in 2 places -
the rear engine lid lock plate and
the right side of the luggage compartment.
you might also check the forward part of the door jambs on both sides and on the inside of the front trunk lid.
If all else fails, you can call PCNA customer service. Give them the VIN and they will read back to you the entire options list on the car, including the paint code.
good luck
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Steve
'85 911 Targa