Need a mirror part

[farmall99]

Got my 08 Tow mirrors about a week ago, got them on and love them btw. Was driving the other day and heard something come up and hit the back glass. I didn't thing anything about it at the time, but when I got home I realized that the plug that covers up where the turn signal would be on the passenger mirror is missing. Do any of you all know where I could get this piece? I have given thougt of just putting turn signals in the mirrors, but just don't have a $100 to spend on them right now.

 

[chappy]

I've never actually seen the non lighted ones so I am assuming its just a plastic piece that sits in there in place of the light. I would think Ford could get just those.