Help! I need to identify my upper control arms please! 70 dart.

Really appreciate all the help> Here is some more info:
1) Its a small bolt pattern, but it appears to be an adapter plate has been added to achieve this.
2) The ball joint is is measuring just barely over 1-3/4" with a tape. square to square. It has K704 Stamped into the steel/ master pro. appears brand new. Im thinking thats the 1.809" ? ( however remember the origin of the post, the ball joint "pushed through" the a arm/stripped the threads, perhaps the previous owner installed the "small" ball joint into the "larger" A-arm? or perhaps the threads are the same and its the ball joint shaft that's different?) Here are some more photos.

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