G'Day Jeff
Great to hear from you.  Sent you an email earlier. As expected your spot on. I have a June 87 US Mk IV and have the Jaguar XKE E Type 4.2 Electric Washer Bottle.  However as you say there is a big open space there now and the Ford bottle would sit so much nicer in that space.  
Just a matter of trying to identify what model Ford it came from which is proving difficult.  I've searched for Sierra, Escort, Sienna, Festiva and just can't find where it comes from so far.
If you ever do find out which Ford it is from I would love to know.
Thanks again 
Best Regs from Oz