Loren,
I was going to give a smart aleck answer, but assuming you mean as it relates to nailheads and GS's. It was used on some 66 Skylark GS cars as I understand, and Riviera.
I saw a 66 Riv with the Quadrajet carb and intake still on it at French Lake years ago, but the air cleaner was missing. Should have got it.
Mark