Linemonkey,
Did you see my last post? Don't run the 90 degree elbow long term...It can cause strange readings for the primary 02...That sensor is critical....So no fittings or adapters and I would get an OEM motorcraft sensor and make sure you get the correct part number...It has to be upstream sensor and the same part number so the pigtail is the same length.
Also you can go to a muffler shop and just have them put a bung in the proper location and they make plugs for bungs...So plug the other hole and install a new bung...No need for new pipes...Just put the new bung about the same distance away from the turbo.
There is a delay and response time that the ECU needs to know based on the distance from the engine and heater settings to keep the sensor tip hot.