Few of the best places I have found with VW paint codes:
TheSamba.com: Is one of the best source for data on paint codes. It contains paint and upholstery codes per model.
Glasurit Color Recipe data can be found on:
TheGoldenBug.com - Pre 1967 Glasurit Color Recipe data
TheGoldenBug.com - Post 1967 Glasurit Color Recipe data