You should probably get one from the 2006 Escape's 3.0 motor. I used a similar one when I did my install. You are going to have to do trim off one of the edges of the throttle body and fill in the gaps around the intake opening in order get it to fit and work properly. Unless the design of the 3.0 motor changed (I'm no expert, but I don't think it did) sometime between 2003 and 2006, I don't think you will need an adapter. If they're the same then, 4 screws on the throttle body will fit into the original holes of the ranger's intake. The throttle body sensor should also fit.
Here is a link that should help you with your installation: http://www.cardomain.com/ride/333436/4