69 side mirror screws giving me a FIT!

[Mhussnatter]

Ok I can not believe this but two of the side mirror screws on one side came out but we're very difficult and the third the Phillip head stripped so I tried to drill through it and use an extractor... No luck it will not budge. The other side I tried an impact driver and None of them will budge... One again stripped and same result. These screws seem like they are aluminum or some type of cheep steel and I am just at a loss on how to remove them without ruining the threads inside the door panel