A body Torsion bars

I am looking for some stiffer torsion bars for my 1967 Dart. PST 1.03 or perhaps FF 1.06 or 1.12.

Thank you.

PST has the 1.02 bars and a discount for us, but you need to call them to get the discount.
I run 1.03 bars in my Dart with a 5.9 motor and it's just a hair stiff for normal around town every day, but the roads around here suck so I'm good with them.
I will say I have bottomed it twice on a driveway or dip crossing an intersection with the 1.02's
Just an FYI, when using heavier bars watch those mounting point sockets on the cross member for twisting unless you reinforce them.