Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 99-1090320 found under Ring Piston by Nato Stock Number Assigned By An. The National Stock Number assigned to this part is 2995004685691, and the Federal Supply Class is 2995 Miscellaneous Engine Accessories Aircraft. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 99-1090320.