Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5D5-03503 ITEM NO. 56 found under Switch Proximity by Oldenburg Group Incorporated. The National Stock Number assigned to this part is 5930013168989, 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 5D5-03503 ITEM NO. 56.