Let me just say that I do not know anything about the escape stereo but going from what I know about other stereos.
Most of the CD and cassette(both in one) stereos that I have seen are double DIN the 2000 Sport has a single DIN opening and if you do not have the premium sound to begin with you would have to add the premium sound amp and all the wiring to get it to work (not worth it IMHO)
If you just want to replace that one speaker I see somebody in the classifieds has all four stock speakers for sale for $20 + shipping (OBO)
