1999 Mercury Sable 6 CD cartridge

Hi
I recently purchased a 1999 Mercury Sable for
my wife. The CD changer is located in the trunk.
However, the CD cartridge is missing. I' been searching
the internet high and wide, and all I get are these
different serial numbers. I'm not sure which cartridge to purchase!
Help!!! Thanks.
Phil

  Pgers11693