Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 321749R1 found under Guide Spring by Navistar Intl Corp. The National Stock Number assigned to this part is 2530001169953, 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 321749R1.