Im attaching the assembly pic for 70 supreme fender trim. i would like to find something similar for the door trim.
I know the plastic holders mount on the studs on the door, but I'm wondering if there is some other fastener on the front and rear of the trim. Seems like a weak mount with just the plastic holders, afraid the trim might fall off on the highway.

 

From what I recall, the door trim is similar with a clip at the front and rear that has a stud/nut attachment setup.

 

Ok, I've received these trim clips for mounting the front and rear of the door trim. Just wondering how close to the edges of the door these get mounted. They either go to the extreme outer edges, in which case you would see the screw head on the inner rear lip of the door when you opened it, or somewhere further away from the edges, in which case you would have to access the screws from the cutouts on the inner door panels. The screws are chrome, with a plastic washer so maybe they are viewed.
Can anyone shed some light on this, if you have the 2.5 inch wide supreme door trim, can you see the mounting clip screw on the inner door lip?

 

On a '68 door peak moulding the chrome screw is visible at each end I would think it would be the same for your vehicle.

 

Yes, the screws are visible when the door is open.