The threaded washer for the striker is not attached its free for adjustability. However there is a keep channel bottom and sides that hold it in place. If your washer drops inside your piller is rotting inside
Jerry Thanks for checking out the video. I am working on more videos I will do one that shows the step by step how to align door. (ONCE AGAIN THANK YOU THANK YOU THANK YOU JERRY FOR CHECKING OUT THE VIDEO AND THE INPUT)
As well note there is really no adjistment to a mustang door unlike 70s cars where you could adjust both body side and door side of hinges on a stang body side is welded in.