Roof packing replacement

The roof packing in my 65 Dart was something I’m not familiar with. It appears to be some kind of fiber and was installed under the metal bows that support the roof and around the perimeter above the headliner area.
1. What. should I replace it with, or is it okay to leave it out?
2. My roof bows are pulled slightly away from the roof skin. I plan to bend them back in place, but what should I put between them and the skin? I would thing there should be something to keep the bows from rattling or chafing against the roof skin. The attached photos show the material and the areas it was in.

Thanks.

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