I wonder if you could heat up the tab with a blow dryer while installing it. that might provide some flexibility?
Possibly, you'd need to be REALLY careful adding heat. Also REALLY careful if forcing the screws tight against the warpage.
I am not sure I can live with the glossy silver paint, it's a mile off on the gloss, also good luck matching the Chinese sourced/applied silver paint to paint your headlamp bezels. What this means (to me) is that a complete repaint is going to be required. Oh well, at least the basic molded part is decent.
