Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 491E1220020-039 found under Cover Strip by Mra Systems Inc. The National Stock Number assigned to this part is 5340016898546, and the Federal Supply Class is 5340 Hardware Commercial. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 491E1220020-039.