I am very new here but i own a 98 taurus se which is built on the sable platform and although i do not know of an indash unit, i do know you can get an indash am/fm/cassette with cd changer controls,(mine has it) and then mount a cd changer in trunk that plugs right in just in front of left fender well in trunk but the plug in might not be there if your car did not have the head unit with the cd changer option installed from factory.
www.crutchfield.com has excellant tech support and they can hook you up with an afermarket unit with installation kit & tech support----hope this helps---can anyone else help?