This K&N air filter element is designed to fit Mikuni HSR series carburetors and has a larger capacity as the filter included in Mikuni kits. Filter has a base outside diameter of 6 3/8" (16.2 cm), top outside diameter of 7" (17.8 cm) and is 3" (7.6 cm) high, where the stock Mikuni HSR filter ZPN237960 is 2 1/2" (6.4 cm) high. The High Capacity filter still fits behind the Mikuni air cleaner cover.