Unfortunately, this is an all too common situation with cars from this era. There are a couple of paths you can take to help you try and track down that elusive part. One option is to join the relevant classic car club - sometimes they run a spares business, or you might find that someone in the club has a spare. Either way, you'll have a few more eyes and ears on hand to help you on your quest. Try to establish if this part was used on any other Fords of the same era or - even better - shared with another manufacturer. Parts interchangeability must not be over-looked. Trawling websites like eBay is another option, as is ringing around local breakers yards. You could also try calling some new Ford dealers - not every dealer bins parts as soon as they become ten years old. Or some of the more well-known classic Ford dealers. If they can't help, they might be able to point you in the direction of someone who can help. The next thing to do is to visit the autojumbles, there are a couple of Ford-specific ones.