Stud size on distribution block for 2022 400

I want to run an additional 8AWG from the DC ground bus bar to the distribution block for my 2022 400, does anyone know the correct stud size?  I'm guessing it is either 5/16" or 3/8" but I want to size the ring terminal correctly. 
2022 T@B 400 Boondock
2015 RAM 1500 Outdoorsman Quad Cab
South Jersey
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