[CompClassics]

Actually it would be a "NAS" bolt and nut, Shelby American Inc. used military surplus hardware when putting together competition spec Cobras, many "AC" installed fasteners were replaced during the conversion from street to racer. Later on SAI used "PREMIER" brand hardware it was a forerunner to brands like "ARP", etc. Plumbing hardware would also be "AN" or "MS" specification components. Heck, even the valve stem caps for the wheels are military surplus sourced pieces. I have provided an example of a "SAI" race shop modified "NAS" bolt (note the milled bolt head)...to really get down to the hardware "SAI" used you need to pay attention to the markings or manufacturer's markings found on the hardware!