The Metra 5514, which includes the bypass harnes (Metra 70-5513) did NOT fit my 99 Contour. One end fits, but the car's other plug leaving the amp is a small square plug - not rectangular.
Scosche FDK-15 looks like it would work as it has the wide plug and the small square plug, but they did not have it in stock. The installer had some plug that was close enough that he modified it and replaced one plug of the Metra 5513 with it. He cut the 5513 harness - not my wires.
BTW, the Scosche FDK-8 that has been mentioned on here looks to be the same as the Metra 70-5514 (a complete kit), but uses the same type of plug for the bypass as the Metra (the wrong one for my car).
Lastly, I'm not sure my Sony 7050 sounds better than the factory amp (they did not bypass the amp as I had asked, so yesterday I took it back - so I've heard both ways). It is louder now, but I think the factory amp was a less distorted. Now I'd love to be able to fit a small aftermarket 4 channel amp into the same location as the factory amp, but that's very unrealistic.