Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 59307-88-15 REV A found under O Ring by Cone Drive Operations Inc. The National Stock Number assigned to this part is 5331016653559, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 59307-88-15 REV A.