Door post, Door pillar Connects to the outer rocker panel QuestionHELP

hey guys, I'm restoring a 1960 Chevrolet Apache c10 series pickup, and im trying to order parts so i can get this truck done as soon as possible. Im a diesel mechanic but this is my first restoration project. If anyone can help me out, im ordering outer rocker panels for the truck but right where the door posts are (right where the door hinges) the piece is rusted out right where the outer rocker panel ends and im trying to find the part name so i can order it. I was told its called a door pillar but im not sure, and most of the part companies i called didnt really have a clue. if someone thinks they can help me out i really apprechiate it cause its delaying my project and if someone needs me to better explain it i can show pictures of what im talking about but i really need some help. thanks.  

try www.americanclassic.com  they should have replacement bottom door pillars and footwell panels