Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 73AG4 found under Spark Plug by Grimes Aerospace Company. The National Stock Number assigned to this part is 2920008169844, and the Federal Supply Class is 2920 Engine Electrical System Components Nonaircraft. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 73AG4.