Does anyone know where I can find pinstriping for an 82 berlinetta?

 

Petition Phoenix Graphix to start making them. Hit up your local sign shops and see if they can cut you a reasonable copy. Grab the Parts & Illustrations Catalog, and look up the original GM part number. Stalk Ebay like a hawk and try to find a New Old Stock set. The upside of being a less in-demand decal, is that originals might be easier to find.