Take some pictures.
Go to the local Ford dealer parts department.
Show them the pictures and ask them how they can help.
You might also talk to one of the service managers and see if one of their mechanics could give you a tip.
If they can't/won't help, find the biggest parts nerd at Napa and see what they say. There's this guy at my Napa that looks like a blob from a sci-fi movie (really nice guy) and man does he know his parts!
Also, post the pictures you take here so others can see what's going on. Remember, a pictures worth 1,000 words....and you only wrote like 100. Ha!