Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number E9AR104-0070 found under Ring Set Piston by Optex Systems Inc. The National Stock Number assigned to this part is 2815014345179, 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 E9AR104-0070.