Torsion bar - odd markings

I have not tried firm feel. I bought some 340 bars to replace my /6 bars locally. Thats kind of strange that they both had 890R on them. It must have a passenger side t-bar on the drivers side and handled a little weird. Shopping for new should be easy as most vendors have them listed by diameter. Mancini bars carry the same part numbers as above, just a different prefix.