Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 17-04120 found under Light Warning by Peterbilt Motors Co. The National Stock Number assigned to this part is 6220015293973, and the Federal Supply Class is 6220 Electric Vehicular Lights And Fixtures. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 17-04120.