It would be no problem to fab one. I think there is a broken one from a 1600 laying outside my friends shop. All it really amounts to is a piece of 3 1/2" round bar with two pieces of 3x5? tubing and some 1" flat welded to it. You could almost surely reuse the tube and flat from the old one if it broke. Badger....there is no "inside" to put tubing...the main member is solid round barstock. Ours are about 25 years old and have never given us any trouble. I've seen some 1600's broke, but they were tube instead of solid. The picture is not quite accurate.  Key # 10 is actually welded to the rockshaft on the actual part.