On a brand new '21 P1000-5 SE, factory bolts way too tight! While installing the rear door storage mod, I did the right side first. The round head 5mm hex drive bolts were overly tight but no problem removing them. On the left side, the guy must have had his driver adjusted to "strip the threads" mode. I didn't notice that the bolt heads had been slightly damaged by the 5mm bit at assembly - it appeared the driver bit was either not seated all the way or was pulled out while the tool was still impacting. They were exceptionally tight. I used an impact driver with a new 5mm bit, but didn't notice the damage that prevented the bit from seating fully. Three of the bolts head hexes were stripped out with enough damage I couldn't get a bit fully seated - had to slot them with a Dremel and use a flat blade driver and an adjustable wrench as a cheater.
Went together well, though. Used an oscillating multi-tool to "shave off" some of the thickness of the color panel on the inside so the retainer nut on the push button hood pin would fully engage the threads on the button (this also allow the color panel to sit closer to the door.