Holy crap lol, I was looking for threads and other forums for this, last week and this week. I did this mod Sunday night. This has got to be fate man lol! Hopefully this is the same access for the 19 Denali. I have a 2015 Chevy Diesel 2500HD. There's 4 torque screws on the side. You can see the top two by just looking in, the bottom two you have to pull the rubber sleeve out and you can see them. The scary part is pulling off the back. I'd say lift up and towards your head(it takes some force). I absolutely hate and always get scared of breaking clips or plastic inside. The second pic is the QC charger I went with, its solid and charges fast, found it on amazon for like $13. You also have to bore out the existing charger hole for this QC charger to fit, but that's not hard either.