Larry:
Both should have four bolts, unless your arms are from late 75. Warren posted the changeover point.
Do a "search" under "aluminum trailing arms" and you will find dozens of threads describing the problem you are having.
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'66 911 #304065 Irischgruen
‘96 993 Carrera 2 Polarsilber
'81 R65
Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13)
Ex-'88 Carrera (Sold 3/29/02)
Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04)
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