Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 397.563 found under Coupling Drive by Webasto Thermosystems Inc. The National Stock Number assigned to this part is 2590012446239, and the Federal Supply Class is 2590 Miscellaneous Vehicular Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 397.563.