K&N Custom Round Racing Assembly Red 4.5in ID / 5.875in OD / 1.75in HeightK&N Custom Air Filters for Single or Two Barrel Carburetors K&N custom air filter kits are designed to boost performance from your carburetor while keeping the dirt on the outside where it belongs. These assemblies come with custom chrome top and base plates and the famous K&N High Flow Washable Air Filter. This Part Fits: Year Make Model Submodel 1975 1981 Triumph TR7 Base