Biebs

If you can’t get a square or messed up the square : Follow his steps exactly, but instead of the square punch.. we used a 25mm circle hole drill, and a washer on the bottom side for the the clamp to grab on to. It sealed just as good as the way it’s supposed to work and has had no leaks but still would recommend the square if possible

Side note, the Square holes are 100% necessary for the stock clips to work and pull it tight so follow his steps exactly and rent/buy that tool if you can the clips (I’ll add a photo) have little pop outs that clip into place but only a square will do. If you absolutely can’t get that tool or rent one and can’t dremel a perfect square, I’ll post another on a suggestion

Here are some pictures of the interior part if needed :

I opened up a 2020 gmc 1500 - it did not have the factory wiring, right into the pillar like the 2500, but it is possible to run the wire from the harness just would have to make some modifications

Gotcha! I appreciate it!

Amazing post. You are the only one! .. I know you kinda answered this, but if you were to redo it.. you WOULD use good silicone on all of them? Or would you just use the foam double padding they have?