[mrein3]

I'm kinda late to this party. FWIW, I used a hole saw to cut those side vents. You need to figure out where the center is, make a pilot hole, then cut with the hole saw plunging it straight at the dash. I could tell you the size of the hole saw I used but I'm in Paris and the saw is in my shop in Minnesota.
I used a 1/2" drill and took my time as there is a lot of torque cutting that hole with the contour of the metal.
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