I am afraid that the illustrations i posted are all that is in teh service manual for this car (I know how frustrating that is, working with htese every day). I used to think it was jsut what Ford made available to us aftermarket techs, but after having an opportunity to see what the parts dept guys in the dealer work with, it is often not any better!
In my past experience with Ford products in general, I have found that they rely heavily on snap together linkage parts whenever possible, probably to save on assembly and small parts costs. I suspect that the broken part you have is just a piece of the part in the illustration, if you look around carefully down below that location there is a remote possibility that you may find some more pieces to the puzzle.
Another thing to keep in mind is that very often ssmall parts such as these are not available separately, unless they are a high failure item, in which case a redesigned part may be available to supercede the original design. Often the only way to purchase small pieces is as an assembly or part of a service pack for the repair. In any case, the only source for parts of this type is going to be the Ford/ Lincoln dealer.
When faced with similiar dilemmas at work, they are usually very easily solved by contacting the parts dept at the dealer. These guys deal with this stuff every day, and will very likely know just what component you are describing; if you can drive the vehicle in and show them the damaged part, even better. Most parts of this type are routinely available within 24 hrs; they have a great service parts system!
If you cant visit in person, what I routinely do is call the parts dept guys, and fax them an illustration such as I posted for you, with the broken part circled in the picture. I have found through experience that this eliminates 95% of the confusion in the process.
If I should come across any more information, or a better illustration, I will surely post it for you.