Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MB501063 found under Back Up Ring Prefor by 2Mb International. The National Stock Number assigned to this part is 5330015664024, and the Federal Supply Class is 5330 Packing And Gasket Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like MB501063.