About 15 years ago I replaced the deluxe door panels on my 69. Unfortunately I used the original fuzzies which are now shot, so I need to do the job again with some NOS felts I've squirreled away. The original fuzzies guided me on where to drill the holes into the metal band of the new door panel.
I used a box of brad or small gauge finishing nails. Cutting both ends off, then bending them into the shape of a staple to fit the holes, pushing through the felt and door panel, then bending them on the back side to hold the inner felt into place. I was happy with the result, but this time I will look for a less shiny nail, maybe something in a dark brass. I would be happy to post a pic if someone with an original wants to provide a comparison of the appearance.