Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number U1603HOLDER found under by Aristo Grid Lighting Technologies. The National Stock Number assigned to this part is 6250011946526, 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 U1603HOLDER.