I think everyone will figure it out Art if they go to the link, knowing whether it is a Grade 5 or Grade 8 bolt is the important thing. I described how to tell that. I think they are likely all to be Grade 5 bolts.
Torque for 5/8 - Gr.5 = 135
Torgue for 5/8 - Gr.8 = 170
As dieselguy points out the 5/8 bolt has a 3/4" head (socket/wrench)
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