Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A1231 found under Cover Fluid Filter by Am General Llc. The National Stock Number assigned to this part is 2940003607962, and the Federal Supply Class is 2940 Engine Air And Oil Filters Strainers And Cleaners Nonaircraft. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like A1231.