Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PA2000-99-159 found under Bushing Tapered by Applied Optical Systems Inc. The National Stock Number assigned to this part is 5365016301816, and the Federal Supply Class is 5365 Bushings Rings Shims And Spacers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like PA2000-99-159.