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We have 4 Rockwell Meritor calipers on our bus and I just finished a complete overhaul of all 4 including new chambers. You have the current slide pins which are the upgraded version from the original pins which used O-rings. Rockwell did however add a additional single string that goes on the top pin only to help return the caliper. I'm not familiar with that spring that goes between the pins. To me this doesn't seen to serve any purpose at all.

Nice work Jack, I just ordered the new pins for mine. I was wondering about the o-rings, I saw them on a lot of the diagrams. Seems like that would hold crap on the pins once it gets in there. I guess that is why they got rid of it. My pins were not in bad shape other than in the middle where the crud had gathered around the retaining pin. Over time I am sure this is going to allow the chrome to peel off so that is why I decided to go ahead and replace the pins. 

I will have the new pins hand for when I have the ambition to go back in and replace them. I don't want to wait too long as it might be a pain to replace those retainer pins again if they get stuck. 

The spring is an anti-rattle device, keeps the caliper from rattling/chatter on the pins.