Torsion bar - odd markings

Ok, I just went out to look at the bars i took off of my car. These bars are considered to be "890" bars, and they measure 0.87" in diameter because my /6 came with A/C. Heres what the #'s look like
UDU UDX One end
891L 890L

891L 890R Opposite end
111 151

I have no idea what these other markings mean!!
Yea - I know and the 282/272 numbers on mine is really confusing.
Unless.... the previous owner replaced one in for some unknown reason. But, they both looked like they were the orginals. Very odd.
Are you going to use those bars...?