When running a custom air cleaner on a Harley-Davidson, the carburetor support bracket makes sure that the carb is securely mounted so the manifold can't rotate, making the carb sag downward. When running a custom air cleaner (such as a Lowbrow Louvered Air Cleaner or a Gasbox Dog Dish Air Cleaner) on a Harley-Davidson Evolution Big Twin or Sportsters engines or a Twin Cam engine, breather bolts are often needed to complete the installation. See Additional Information below for complete fitment. See Additional Information for fitment.

• Can be used in conjunction with most breather kits (where applicable)
• All gaskets and mounting hardware included
• Breather kits/bolts sold separately