Early A ext door handles....painted??? How to remove?

Ok I used Clean Stripper spray on. It took a few times, but the paint came off. Revealing a super dull, hazy handle. Now I have another question, I see the repop ones, however they are only for the front doors. The rear door handle that I have, have a different type of push rod, like a S shape. Is it possible to take apart the old handles, get that push rod out and install it into the newer repop handles??? I cant tell how to take it apart. I see one screw, but then it looked machined onto the other points??
Lastly, there seems to be a O ring that goes on the thumb push, from inside. Mine are gone, is there a replacement for that ORing? looks real thin