Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 076-63991 ITEM 2 found under Switch Proximity by York International Corporation. The National Stock Number assigned to this part is 5930013688753, and the Federal Supply Class is 5930 Switches. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 076-63991 ITEM 2.