I'm looking for another 8-10 of them myself. Totally NLA, so eBay or a generous Alfisti is your best bet.
I'm going to experiment with a nylon/resin casting kit, using one of mine as a mold. I'm worried the result might be to brittle, but then again they don't really bear a lot of weight, so it might work. And restorers use those kits to manufacture all kinds of parts, from steering wheels and shift knobs to hood props.
Now, for the lower row along the side, you can use a standard plastic mollie (3 or 5 mm? Most Lowe's actually stock them in the hardware section, with the auto trim bits) in the metal, then use a stainless screw and washer to retain the trim. Since you can't see it anyway, no harm, no foul.
as good as a car can be... briefly.