Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1028-4B found under Base Lampholder by Bae Systems Australia Ltd. The National Stock Number assigned to this part is 6250011652776, 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 1028-4B.