S&S S&S, cylinder base gasket set FR/RR. Micropore

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S&S  S&S, cylinder base gasket set FR/RR. Micropore

36-47 61″/74″ Knucklehead; 37-48 74/80″ Flathead; 30-36 VL models; 21-29 J models (NU)

Fits 3-5/16 & 3-7/16″ stock bore cylinders. OEM replacement reference 16774-21 (old 46-21).