Torsion bars..which brand?

I was looking at ordering the torsion bars and adjusters for the 70 Duster project. Being it will be a small block I am leaning towards the .890 bars. Just not sure what brand to go with? Mopar (Mancini Racing), PST, or Firm Feel? Are they mostly made by one company and rebadged? Also are they similar to the B-body bars where you have to watch what brand you get because the hexes are not clocked correctly?