Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 8133939 found under Crab Cylinder End by General Motors Corp. The National Stock Number assigned to this part is 2815008559912, and the Federal Supply Class is 2815 Diesel Engines And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 8133939.