Keeping your air cleaner filter fresh is key in maintaining your engine's performance. But it never fails. You have everything taken apart only to discover you've lost a key piece of the cleaner. Never fear. Mac's offers a line of one and two barrel carburetor air cleaner replacement parts. From bases and clamps to filters and wing nuts Eckler's has the breather replacement parts you need for your classic Ford.1966-1977 Ford Bronco breather base replaces the often bent or missing 2bbl air cleaner base.