Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 439 438 C91 found under Parts Kit Carbureto by Navistar Intl Corp. The National Stock Number assigned to this part is 2910010263144, and the Federal Supply Class is 2910 Engine Fuel System Components Nonaircraft. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 439 438 C91.