1972 C10 Aftermarket Problem Door Bodywork and Fixing All Remaining Issues. 

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Can’t promise it will be the last axe incident🤣 🪓

Absolutely!

I made a template off my old door for the initial holes then later opened them up using the same style mirror I will be using to get the alignment and overall size correct. If you don’t have access to an old door there are original GM drawings online that give you the correct measurements with a Google search. If you’re going to use a Chevelle mirror with a higher up on the door mounting like some do for a sportier mirror I would get the mirrors first to template.