Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number E4 32IS 120 found under Ballast Lamp by Howard Industries. The National Stock Number assigned to this part is 6250014403647, 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 E4 32IS 120.