What do these torsion bars belong to?

I will have to check Thursday when I go back over there. I just read the one side. What makes me curious is the most bars in a pair are only one number off ie 628/629 etc. and these are 368/328... I will have to pick his brain again and measure the diameter as well as take a look at the other ends. Hmmmm, I cannot even find anything remotely like the numbers on Google or elsewhere which is odd.