Okay, try this.
Don't worry about forming or machining the sway bar. Use a straight bar and then just add fittings to the end.
In the picture you can see that they have splined ends, but you can work around that if you like. Two options. Grind two flats and use that to react the loads. Or you can drill it and dowel it. I would suggest that you use steel links, not aluminum. The bearing loads would be to great and would deform the aluminum.
Hope that helps.
