Re: Ball joints!!
Since 1/4" was the orig size, it's 1/2" head is correct and what I turned the 5/16" rivets down to. All rivets are mallable, low strength steel but rivets still have more holding power than most bolts. Buy the 5/16 and turn down the heads.
Incidentally, all FACTORY assembled Chevrolets that I have ever seen had ball joints installed as pictured and described.
Dave
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