Replacement. Each. White nylon. Does not include screw. This is the late 65 style with the thinner shaft boss. The change was a running one and no firm date is available. 

1965-1973 MUSTANG LATE 65, FORD 2100 2V AND 4100 4V CARBS

1967-1973 COUGAR FORD 2100 2V AND 4100 4V CARBS

1965-1970 FALCON (BEFORE 1/1/70), FORD 2100 2V AND 4100 4V CARBS

1965-1973 F100-F350 FORD 2100 2V AND 4100 4V CARBS

1966-1973 BRONCO FORD 2100 2V AND 4100 4V CARBS

1970-1970 FALCON (FROM 1/1/70), FORD 2100 2V AND 4100 4V CARBS

1968-1971 TORINO FORD 2100 2V AND 4100 4V CARBS

1965-1970 FAIRLANE FORD 2100 2V AND 4100 4V CARBS