73 Duster upper plastic door panel

That plastic is very delicate being almost 50 years old I thought about safest way to remove the sweep if the company can't help. I would use a Dremel tool with a cutoff wheel to cut the metal that holds it to the plastic and being very careful. It'll be a slow task but seems like the safest way without putting any pressure on the plastic. The paint job of changing from the gold to black came out very good on the plastic.