Guys, 

Body trim is something I know zero about. I'd like to put the drivers side trim back (less the rear section) on the 65, but have no clue what clips I'll need. The trim changes width from the front to back, so it likely needs an entire range of sizes to get it mounted. I'm not prepared to attempt to remove the passenger side trim to look, and cannot find anything on line as to what I'll need. Even the Pontiac sites don't respond to questions about 65 trim. I have only a couple of rotten clips.

Anyways, the body from the front fender through to the quarter has a series of holes. I know each section of trim has a combination of both push in and bolt on clips. They bolt on wherever they can be accessed from the back (at the ends of the trim sections). Push in when it cannot be accessed. I have no idea how these push in clips work. Are they fitted into the trim then the trim gets bumped and bolted on? There is a total of 12 holes in the body with one using a small screw inside the door jamb.

Also, where could I get the correct clips, and how are they even measured?

I've included a couple of shots to start with. Any help is appreciated on this new saga,

The 3 trim sections as viewed on the car, but opposite side.

The three sections viewed from behind. You can see the lone push in clip (with the whisker), and the remains of a couple of bolt in clips on the ends,