Factory dual hood scoop hole location photo request

If I may make a suggestion, get a couple different sizes of hole saws and practice on some scrap material. I used DMT grommets which I believe are a little smaller than the alleged factory 4 1/8" diameter holes.
I took this picture for another thread that was on here the other day but related to the size. This is the DMT sitting on my 4-1/8 lennox hole saw. I will do a practice hole like you suggest but replace the bit with a rod once it drills through. A member suggested that on the other thread and I have done that before but had forgot the trick.

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