99 EB head unit part number

[Vicarofhell]

Recently bought a 99 EB Expedition with the MACH system to pull my car trailer with. The factory head unit is missing and I would like to know the part number to look for that would allow use of the factory amp/sub and the 6-disc changer.

 

[Vicarofhell]

grabbed a head unit from Cash-N-Carry, now just need to the changer magazine. Anyone know the part number for the 99 changers??