Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5-520 found under Dummy Coupling Automotive Air Br by General Motors Corp. The National Stock Number assigned to this part is 2530002703878, and the Federal Supply Class is 2530 Vehicular Brake Steering Axle Wheel And Track Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 5-520.