The gasket on the air cleaner elbow side of the carb. Bolts between the carb and elbow or directly to pancake filters on the HS2 carb only. Actual product may differ in color and/or general shape from photo shown. Ref: 12H862, 12H862B, 12H0862, ACA8014.
See 12G2125 for HS4 carbs.