cab corners, "eyebrow" over windshield, front fenders (over headlights and behind wheel down low), bottom of the doors, hinge pockets, and rockers/steps. that sounds like a big list, but 1) they weren't rustproofed very well back in the day, and 2) all sheet metal for that series is reproduced so repair is straightforward (unless all of these areas are gone and then you should probably start with a better example)
