In order to mount an air cleaner to the carburetor use V-Twin #34-1425 air cleaner adapter available separately. Suggested to use with #28-0981 38mm Carburetor Rubber Sleeve. If you would like to return your new, unopened, and uninstalled part. Find the item you ordered. The most common reason is "Doesn't Fit".
Add details like I tried to install this part, and it didn't fit. If the item has been opened, installed, or used, we are unable to accept the return due to safety concerns.