Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number FC1 DT304 HP260 found under Field Change Kit by B Johnson William And Associates Inc. The National Stock Number assigned to this part is 6665012923470, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like FC1 DT304 HP260.