rear window trim clips

I removed both the windshield and the rear window from my 66 Dart tonight. I am attaching pics of this at the end of this post. You will see that I am going to have some metal work in the front corners of the windshield. Its not bad as I was expecting so Im happy with just this small amount. I am guessing there are no aftermarket pieces for these areas? The next question is where can I find the metal clips for the rear window trim. I am going to need 8-10 of them. What is the best method for removing the screws that the heads are rusted. Just drill them out? Thanks for any help with this.
Rod
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