I'm about ready to paint my pillar post and they appear to be a different metal from the rest of the car.The rocker panels look to be made out of the same metal.Are they galvanized or what? Are there any other areas with this type metal? It is on a 67 chevelle. How do I need to prep these parts and what kind of primer do I need to use? Thanks!

Yes, the rockers are galvanized.