Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2137-1 found under Cup U Backing Plate by Benton Harbor Engineering Inc. The National Stock Number assigned to this part is 3930006099547, and the Federal Supply Class is 3930 Warehouse Trucks And Tractors Self-Propelled. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 2137-1.