Set of 4 Small Black & Red 39mm Air Filter Pod Set - Honda CB500 CB550 CB750 All black small size 39mm high flow tapered air filter pod with red foam. Fits Honda CB500, CB550, CB750 and others. Fits the CB550 without hitting the frame like other larger filters! Comes with black mounting clamp. Sold individually, or if you want a set of 4, get em here. Keep in mind, for the bike to run smoothly, you may need to install larger jets and make other adjustments to match the higher air flow. The rubber mounts are flexible and can be mounted on 38mm and 40mm carburetor flanges. IMPORTANT: Be sure to measure your carburetor prior to purchase. Also measure how much room you have between the carburetor and the frame or any side covers. Use the dimensions below to see if these will work on your bike. Just because the filters fit the carbs doesn't mean they''ll fit in the bike without some obstruction. Dimensions: 39mm ID where it mounts to the carburetors | 50mm air filter length | 70mm total length including rubber | 61mm outer diameter of the filter Please See Product Description for Fitment and Important Details.