Wow those are not the same as my eldorodo calipers. Mine use a straight spring. My were new from TSM.
It looks like there are two styles of calipers. I didn't know that.
http://www.tsmmfg.com/3120.html
http://www.tsmmfg.com/3121.html
(TSM clearly says they don't sell the lever and springs separate)
I have the 3120 and it just has a straight spring, I had to make a new bracket so the arm would turn more, but now my parking brake works great. I was going to try to fab up a longer arm but was not successful.
I know this doesn't help you since you have the other style caliper, that was one of the issues with using these on the cheap, you can get re-manufactured calipers from Autozone etc, but not with the arms. You would think someone could crank these out on a plasma table... cough Carl...
Nathan