What other parts on 78 F-150 was galvanized besides the inner fender , inside bed , and the cowl ??

 

The front fender inner braces and the inner and outer rocker panels can be added to your list. Ford also used a sinc rich primer in a number of places on the trucks. My pictures show the bed support stays, some parts of the cab floor and some areas under the hood.

 

Seat brackets too I believe. Not the actual sliders, but the "bracket" that bolts to the floor of the cab and the slider.

Here's a pic of one I just messed with in putting a new bench in the rear of my 74 crew. The black piece I wrote "passenger" on is a C shaped metal channel and it is in place of the sliders for the stationary rear seat in the crews. The galvanized part is the same as in the front under the sliders though.