Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 42340 found under Parts Kit Horn Button Switch by Colson Corp The. The National Stock Number assigned to this part is 2590005254387, 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 42340.