Mikuni Adapter 6 Hole for fitting Harley CV or S&S Shorty air-cleaners to HSR or HS40 (when using additional Mikunioz sleeve) Mikuni HSR adapter includes oring and bolts For fitting stock & Custom Harley CV air-cleaners to Mikuni HSR Carburetors The extra 3 bolt holes suit S&S Shorty air-cleaners where some mods maybe required Will also adapt to HS40 when fitted with ABA65/55-17 sleeve available on Amazon This is the latest version Genuine Mikuni factory item