Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 0039978245 found under Spacer Ring by Mercedes Benz Ag. The National Stock Number assigned to this part is 5365011747650, 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 0039978245.