Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1159PM20054-11 found under Bushing by Gulfstream Aerospace Corp. The National Stock Number assigned to this part is 3120011643311, and the Federal Supply Class is 3120 Bearings Plain Unmounted. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1159PM20054-11.