Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4539-7020 found under Deflector Dirt And by Scovill Inc. The National Stock Number assigned to this part is 2520013392025, 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 4539-7020.