I have front disc brake issue, front spindle mounting bolt hitting sway bar mount on MBM disc brake kit? Need your help

I have no idea where to find that even dr diff says all abody no matter what year use 5/8” i dont know to believe at this point. 1/2” 5/8” too many people with different knowledge that all oppose each other.

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That's because you're mixing up information about '73 and later disc setups, '72 and earlier Kelsey-Hayes disc brakes, and drums...
Get the right hardware for 73 and up factory disc brakes; either from a member, from Dr. Diff, or shorten your own with thinner nuts- and put this to bed. It ain't brain surgery.