AR stamped on Plug Wire Looms

[MyRed67]

  I have what I believe are the original Spark Plug wire looms for my '67 Camaro 327.   The 2-wire Looms that fasten to the out side Valve Cover hold-down bolts have an AR stamped on them.   Can somebody tell me what this AR stands for?   Thanks.

[JohnZ]

  I have what I believe are the original Spark Plug wire looms for my '67 Camaro 327.   The 2-wire Looms that fasten to the out side Valve Cover hold-down bolts have an AR stamped on them.   Can somebody tell me what this AR stands for?   Thanks.

That's the supplier's identification; GM required it on most outside-purchased parts.

[MyRed67]

So who was the supplier, AR?   anybody know?