I'm not at home so I can't check on one of the catalogs I sometimes use. It seems like it may be Tool Shack, but the name is fuzzy. Maybe you can find it with a Google search under automotive tools or something similar.
There are at least two types. The Ford tool is just a flat piece of steel, roughly 1 1/2" x 8" x 1/4". It inserts into two slots, one on each cam, on the transmission side of the engine. The tool will not insert unless the cams are properly lined up.
The second type is more generic and can be used on other similar engines as well. It goes between the two cam sprockets and hold them in place once they have been lined up.
The Zetec engine does not have keyways on the sprockets. The best way to line them up properly is with the Ford tool, which also depends on a tool to line up the crank as well. You will have a hard time lining up the cams properly if the sprocket retaining bolts are ever loosened. If the cams are properly installed on the sprockets, the second type of tool works fine. If not, the Ford tool works better.
Sometimes the Ford factory type tools are sold by other tool companies, sometimes they are not.
Another alternative would be to visit a dealership technician (or even an independent shop) and find out which tool trucks call on them (Snap on, MAC, MATCO, etc.). That is where most professional techs buy their tools. Call the tool truck dealer and find out what he can do for you.
Anyone else care to share their experience as well?