The Escort part of the 100E - is that not like a special edition name, like the Escort Harrier, Mondeo Mistral, or the Granada Sapphire (a 2 tone Mk2 model), rather than the proper model name?
What I'm trying to say is that if the "Escort" part shows a trim level, I can see that you would ask for, say, a drivers seat for a 100E Escort, but if you need something mechanical, that would fit all the 100Es with that engine/box, you would ask for one for a 100E.
Or have I missed the point too.