Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 45643-042 found under Cushion Seat Back Vehicular by Uop Inc. The National Stock Number assigned to this part is 2540012436490, and the Federal Supply Class is 2540 Vehicular Furniture And Accessories. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 45643-042.