Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number RB2-500 found under Spacer Set Sleeve by Vibration Mountings And Controls Inc. The National Stock Number assigned to this part is 5365016554758, 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 RB2-500.