fs,
I was under the notion that Windsors were not installed until 1989, I am surprised to read that one was installed in an '87 model. Can you determine by looking at the motor which it is?
If it is true your Pantera is equipped with a Windsor, I think the first question you need to ask Mr Stauffer, if this car had an Amerisport emissions system installed in it. If so, its an entirely different set up.
The Euro Panteras with Windsors had a late model US Ford air filter assembly, vertically quite thin, with a stamped aluminum top and tin bottom, see the pic below. Different than what's in the last photo. I apologize for the poor quality of the pic, my big dollar scanner wouldn't reproduce this picture cleanly.
cowboy from hell