FYI, the left door has captive nuts for the mounting bolts. The right door uses a triangular 1/4" steel plate, drilled and tapped, inside the door. They're a bitch to hold in place while u start the bolts and are often found lying in the bottom of the door. Many right mirrors added post factory were mounted with big sheetmetal screws, which is incorrect. Anyone adding a right mirror to a truck that didn't have one from the factory will also need the steel plate.
Plastic trucks suck...
Iron trucks rule...