[Cusser]

I use a home-made extra long 10mm wrench, or the one someone made for me.

 

[Cusser]

That vice grip looks interesting, I had not seen one like it.

I find this Vise-Grips really handy, even for plumbing, Model 12LC. The Original™ Large Jaw Locking Pliers - Tools - IRWIN TOOLS

 

[Cusser]

Ironically I searched Autozone online first for these studs. Nothing came up in the search. Their search is really bad for a company of this size.

They're not the only ones !!! I needed a certain type of Glidden paint, knew Home Depot is their largest distributor. So I tried searching homedepot.com for that type of exterior paint, could not find it. I finally typed Glidden GL9611 into Google and then located it at the local Home Depot !!!!

 

[Cusser]

M6 x 1.0mm for sure, 10mm wrench. I didn't have ANY issues with my fan clutch nuts rounding on either my 1998 or 2004 Frontiers. I used to use blue Loctite on these, but then it was more difficult to simply unscrew the nuts after initial loosening, so when I swapped in new warranty fan clutches on both those this summer, I didn't use Loctite or sealant, just the 6mm nuts.

I would guess the truck with the rounded-off nuts had cheap aftermarket nuts on it....