template for 69 Camaro rear 1/4 panel grill holes?

[Unreal]

I had one replaced quarter, so I used the other side to make a template, and then put it inside out for the side I needed to drill. I was very, very careful, but after I marked the holes, I stuck the louvers over the marks. They were a little off. I adjusted until I like it, and drilled pilot holes. I was still a little off? I finally got it right, but what a PITA. I vote for the idea of using an old set of louvers as a template. The louvers fit a little bit into the indentations on the quarter. With the old louvers as a guide, you can get it exactly right.