Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1 03504 602 found under Ring Piston by Messier Dowty. The National Stock Number assigned to this part is 2805004679140, and the Federal Supply Class is 2805 Gasoline Reciprocating Engines Except Aircraft And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1 03504 602.