AIR CONDITIONING MOUNTING STUD INSULATOR for the 64-77 GM A body and B body.
Set of 4.. with dual sided threads as shown.
Not huge with its 3/4" (21mm) OD and 5/8 AF thread.
Fits but not limited to:
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64-77 GTO / Lemans /Tempest
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64-77 Chevelle / Malibu / El Camino
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70-77 Full Size Impala
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Plus others.