Lower ball joint nuts

I have asked this ? in another tread but hop more see it here.
I got LBP brakes for my 71 Swinger from a 73-up disk car. When I got them there was no bolts for the lower ball joint to spindle. Does any one know what size these are? Where might find them? Or will the bolts from my 74 parts car drum brakes work? Any help would be great folks. Thanks in advance.
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