Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S58-5 found under Mount Loudspeaker by Spectra Physics Inc. The National Stock Number assigned to this part is 5965001610040, and the Federal Supply Class is 5965 Headsets Handsets Microphones And Speakers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like S58-5.