Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SD31953 found under Lamp Unit Vehicular by Warner And Swasey Co. The National Stock Number assigned to this part is 6220011540204, 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 SD31953.