Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number UP UP321HR found under Brake Shoe by Napa Automotive Parts Co. The National Stock Number assigned to this part is 2530012442512, 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 UP UP321HR.