Doesn't the "White Book" list the numbers for left and right torsion bar fitment for model and year? And if you can read one torsion bar number it should be simple from there. Also the diameter of the torsion bar will help to ID them too. Obvious the larger diameter (thickness) is the heavier (more spring tension) torsion bar. When I say heavier/spring tension it will also weigh slightly more too. Not sure but I thought or think the more tension torsion bar(s) were on the right passenger's side due to the engine offset to that side??