Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S21432 found under Tractor Full Tracke by Navistar Intl Corp. The National Stock Number assigned to this part is 2410013027307, and the Federal Supply Class is 2410 Tractor Full Tracked Low Speed. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like S21432.