Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 550355-01 found under Lampholder by Satair A S. The National Stock Number assigned to this part is 6250008940763, and the Federal Supply Class is 6250 Ballasts Lampholders And Starters. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 550355-01.