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Should be at tractor supply or any trailer parts place.
Try searching this:
Trailer coupler adjustable hitch mount channel 4 hole
On a sight that rhymes with egay.
Let me see if I can find the pics.
Here, he has his pics linked in the first post.
http://www.steelsoldiers.com/showthread.php?103229-My-M101A3-Modifications-new-front-hitch-3500lb-electric-brake-axle-etc
The whole lunette/surge brake assembly will unbolt with 4 bolts. You can then add anything you like to the top. Another member welded a receiver hitch on there, so he could put a ball coupler or pintle coupler depending on what was needed.