Hi Keith , My parts book for 1957-58 showa one special studs per side & 3 std studs but my series2 &2a shows 4 special studs per side. They must of had a few goese to fix the problem with the arms coming loose . As I said my 80 had 3/8" studs which were changed to 1/2" & then they started using the special studsWayne


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Wayne



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