Air control.
BSA - A50W Wasp (1966-67) Long. 
A65L Lightning (1966-67) Long. 
A65H Hornet (1965-67) Long. 
A65S Spitfire 2 (1965-66) Long.
A65S Spitfire 3 (1967) Long.

Also Fits:
Norton - 88SS/99SS/650SS (1961-67) long. 
Atlas N15CS/P11/P11A (1962-68) long. 
Commando & Commando Fastback (1968+) long. Commando/Roadster/SS/Fastback (1968-72) long. 

OEM: 02-5008, 03-1614.