Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 499-041-021 found under Light Indicator by Interstate Electronics Inc. The National Stock Number assigned to this part is 6210012296391, and the Federal Supply Class is 6210 Indoor And Outdoor Electrical Lighting Fixtures. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 499-041-021.