Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A5300VXY found under Modulator Transmission by W W Williams Company The. The National Stock Number assigned to this part is 2520016264971, and the Federal Supply Class is 2520 Vehicular Power Transmission Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like A5300VXY.