The manufacture number 19-950400 is the Ulta-Fab part. I called Ultra-Fab and asked about a 2" ball. Because the top part is a single piece with ball and threads is aluminum, they did not think it was a good idea to weld a steel 2" ball onto this assembly. The issue is welding aluminum to steel, not strength. I have seen posts were people have do this though.
I have bought a BAL tripod with the gooseneck adapter. The adapter did not fit, so i drilled a 3/4" hole in it and mounted a 2" ball. We have not been out overnight with this yet, but it does stabilize the Scamp
, and sets up like it should. A disadvantage is the unit is steel and heavier than the Ultra-Fab aluminum.