Uni NU-8950 Vespa GT/GTS/GT60/GTV Air Filter Uni Air Filter for the Vespa GT, Vespa GTS, Vespa GT60 and Vespa GTV. OEM #831997 Uni Filter street bike air filters are a direct factory replacement filter and are designed to fit perfectly into your stock air box. They provide unsurpassed airflow, dirt stopping and overall performance.Please Note: All Sales on Clearance Items are Final O.E.M. #831997 Item Number: NU-8950 Washable & Reusable Made in U.S.A.