Jerry - The Kubota parts website shows a lot of clutch versions for the L3450. There are dual-clutch and wet-clutch variants, and serial number breaks. The travel disk and pto disks look similar but have different splines. Give your supplier the tractor's serial number, it's existing clutch type, and whether it's the travel or pto clutch. If all the numbers check out, Kubota's dealer support should be able to get to the bottom of it.