Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 45SP30 found under Cover Rear Bearing by Mack Trucks Inc. The National Stock Number assigned to this part is 2520004957933, 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 45SP30.