h 10.0mm? 24 mmAF 17mmup to 1963Product descriptionDue to their extensive but exclusive range of spare parts, CASA LAMBRETTA can supply all you need for the factory restoration of Lambretta scooters. The majority of their parts are compatible with the series I to III models, but previous models produced from 1947 are also catered for. Most of their spares are made in Italy, with attention to detail and an eye for high quality!OEM numbers (for comparisons):19917024 (INNOCENTI)