Funny - I was about to post about my recent installation. Metra by pass harness DO NOT FIT my 1999 contour. The SCSOSCHE FDK 15 looks like it would fit. note that Scosche FDK-8 looks to be the same as Metra 70-5514 (it will not fit either).
My car has one plug that match Metra's bypass plug, but the other end is SMALL and SQUARE, NOT a rectangle like the other side of the amp!
the installer had a plug that he somehow modifed and got it to fit (I think he cut the bypass harness and replaced one plug - he did not cut my car's wires). No, I do not know what harness he used, but the Scosche FDK-15 looked good, but they did not have them in stock.
