Both the studs and the washers are listed in the Utility section of the parts book, but they do not have a G prefix part number. So not necessarily common, but not too special either.
A standard hex nut is 3/8" tall (same as listed) but 5/8" tall ones are
also available.
That being said, referencing a
torque chart gives Grade 8 as 60 ft-lbs for 7/16 x 20 TPI. So I would use Grade 8. Remember that automobile torque charts generally assume "wet" torque not "dry" torque. I would apply some thin oil to these connections before tightening, otherwise the clamping force will probably be too low.
It's worth noting that elsewhere in the manual, a 7/16 x 20 TPI connection is given as 45-50 ft-lbs, such as for the clutch release lever ball nut, which is a Grade 5 torque (in between wet and dry).
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