Hi Tony
I may have missed if you already got your answer, but here it is. The rocker panel covers that cover the outer rocker panels below the doors were finished with a semi gloss textured finish, which today can be approximated with a product commonly referred to as body "Schutz" (3M) coating in the paint and body business. Don't let anybody tell you that they ever were painted in the color of the car body (aside from two or three pre-production cars maybe). Most of the steel fittings, brackets and fuel components in the engine compartment were "yellow" cad plated, which is covered well by Michael Salemi's previous posts on the topic "cadmium plating".
Regards,Tom
Classic Autos, L.A.
Tom Colitt