I recently installed new Pony door panels in my '66. Because the originals had been damaged like what you describe, I decided to reinforce the new trims. I cut 1 1/4" circles from fiberglass cloth and pulled them slightly, to form an oval shape. I then adhered them over each of the mounting locations. The polyester resin saturated the cardboard backing and gave me a great bond, After the resin cured, I trimmed the keyhole shaped holes and inserted the clips. I have installed and removed the panels several times and they show no sign of stress or tearing.
You may be able to use a similar technique to repair yours. It would certainly be worth a shot before shelling out big bucks for new trims!

Some aftermarket clips are stiffer and thicker than original and will not fit right. Scott Drake now makes a lot of parts that are in that category. I dont have a recommendation, but maybe you still have your OEM clips?

whlnut wrote:

Some aftermarket clips are stiffer and thicker than original and will not fit right. Scott Drake now makes a lot of parts that are in that category. I dont have a recommendation, but maybe you still have your OEM clips?

No, the clips I do have I don't know that they are the original ones, plus I am going from the standard door panels to the Pony interior. From what I understand, the clips for the standard interior are different from the Deluxe interior or Pony interior.  I can't say as I know why there would be a difference since they both have to go in the same holes in the doors. The clips I bought new are the Scott Drake ones and appear to be too stiff.  Thanks  Jerry
 

MS wrote:

A few tips and observations.
Pony panels require specific clips.
Only install panels using brand new clips.
Use water shields as a template on the back of the panels to show where to properly align the clips.
Apply a little grease on the holes so the clips snap in easier.

Thanks Steve.  I have the new Pony clips and the water shields didn't help.  I had to punch new holes in the new water shields to make them fit.  Junk from another vendor.  I even took a tape measure and measured out where the holes were in relation to the outline of where the panel would fit on the door and took those measurements to the panel and placed the clips right on where the holes would be on the doors.  Still couldn't get the clips to go in the holes and finally broke out the fiber backing on a bunch of the holes.  More junk vendor stuff. 
 

Thanks to everyone for the feedback.  I finally got them installed.  I ended up putting fiberglas strips where the clips broke out the flimsy board they call masonite board.  I cut out two strips per clip and resined them to the board.  I then got an addition water shield and held it up to the door and located exactly where the holes were for the clips.  The water shields aren't exactly perfect on hole location either.  I then put the clips in and put the water shield on the back of the door panel and moved the clips where they aligned up perfectly with the hole and with a flashlight made sure the clips were in the holes before I hit them with my palm.  Anyway, they went on.  A 30 minute job that turned into a 3 day operation.