None of the 2008+ North American models have separate rear turn signals, amber or red, AFAIK. Ford does export North American Escapes to Korea, though, so I wonder if those models have amber rear signals.
The 2008+ Mariner tail lamp assembly won't fit into a 2008+ Escape or Tribute tail lamp opening.
But a 2008+ Escape tail lamp assembly will fit into a 2008+ Tribute tail lamp opening. Early media pictures of the 2008 Escape clearly show the upper clear lens with an amber bulb inside (I'll find the picture), but Ford didn't keep that feature for production. There is enough room inside the lens for a 3157NA/3457NA/4157NA bulb, since some police departments and utility companies retrofit that lens for Xenon strobe bulbs. You'd need to do some ABS plastic work, but since it welds very easily with PVC cement, you could probably find some way to weld in the reflector and socket opening from another Ford tail lamp assembly.
If I took on this project myself, I'd get a pair of 2006+ Mercury Mountaineer tail lamps, including the Osram LED modules and the wiring harnesses (for the LED module connectors). I'd cut away and modify the Escape's stop lamp reflectors to use the Mountaineer stop lamp reflectors, which would give you LED stop and tail lamps. Then cut away and modify the Escape's faux turn signal reflectors to use the Mountaineer's turn signal reflectors and amber bulbs/sockets. The LED brake lamps can be wired in parallel with the CHMSL, but I wouldn't try that with regular bulbs, since the brake switch can't handle that kind of current.
The turn signals are another story. You can't simply wire another bulb in parallel with the front turn signal lamps, because it will overload that circuit and possibly damage the Smart Junction Box. Most exterior bulbs in newer Fords are individually switched by solid-state devices in the Smart Junction Box. In fact, in almost all new Fords, the turn signal clicking sound is synthesized using the warning chime speaker. Trailer wiring is usually handled by extra relays. You could use each front signal to drive the input of a high-side FET to drive a rear lamp to another +12V circuit, but the lamps would still flash faster without the load of the rear lamp. The easy solution would be to wire a pair of resistors into each existing rear brake/turn circuit (since the brake lamps are now separated from the circuit), but personally, I hate using resistors, since they'd be heated whenever the brake lamps are on. You could always use a standard bulb and hide it somewhere.
I'd love to know if the Smart Junction Box has extra turn signal pins to drive the extra pair of rear signals. For example, the Fusion and Milan both use the same Smart Junction Box. The Fusion has no rear amber signals, but the Milan does. The strange part is that the rear brake/turn lamps on the Fusion and the separate rear turn signal lamps on the Milan are driven by the same pins, so that means that the software in each car's Smart Junction Box is internally different.
I'd need to think about this one, and I'm still waiting to get a 2010 Service DVD. Ford has changed a lot of the Escape's electrical system since the 2008 redesign.
