Dart Sport Torsion Bar Diameter

My 74 Dart Sport is a very low optioned 198, 3-on-the-tree. From the chart referenced here: identify these torsion bars please
I would think it has .830 t-bars. It has .850. The car doesn't have a/c. I guess they could've been swapped out over the years, but the car was very original when I got it.

I'm wondering if cars with the stupid crash bumpers, which weighed a ton, maybe got the .850's? The front was 62#, the rear 82#! (with all brackets and hardware)

As an aside, I now have a 360 with a 727. Also, I now have fiberglass fenders, hood and bumpers (w/ aluminum brackets). I actually had to lower the front after I swapped all of this stuff.