spool type K frame

Understand that the following doesn't apply to dealer installed a/c. Every time they added factory a/c they bumped the torsion bar size. Slant 6 had small size bar, then with a/c bumped to the 318 without a/c sized bar. Then 318 with a/c bumped to the next 340 without a/c sized bar.
I would replace the OEM slant 6 bars even if the bars had the same numbers. That slant had its weight toward the right bar for a lot of years.