Sure Seal Air Cleaner Spacer fits most 2 and 4-barrel carburetors with a 5-1/8 inch neck. It's designed to give clearance for throttle linkage when using custom air cleaners and also allows the use of aftermarket air cleaners on factory spreadbore carburetors that may have a notch in the flange. Longer air cleaner stud may be required. Be sure to check for hood clearance.