Feature: - Especially for the 1½" SU HS4 carburettor. - Have highly polished chrome tops and bottoms and an up-rated air cleaner, allowing better airflow while trapping more dirt. - Very simple to install, they just bolt to the face of the carburettor. Specification: Color:Chrome Material:Metal Dimension:14x2.5 CM Package Included: 1x Pancake High Air Flow Air Filter Note: 1.We provide clear pictures, measurements where possible. 2.Please check as much as possible to make sure the item is the one that you need. 3.Please allow difference due to manual measurement. .