Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1041-21 found under Shield Spark Plug by Sl Auburn Inc. The National Stock Number assigned to this part is 2925003282073, and the Federal Supply Class is 2925 Engine Electrical System Components Aircraft Prime Moving. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1041-21.