I upgraded to the Doorman aluminum elbows and yes I replaced the O rings before installation.
Notice how the O rings are compressed flat on the plastic ones that were leaking.
Here are the aluminum elbows that were installed and a picture of one that was installed. I couldn't get a clear picture the other one.
I also replaced the upper and lower radiator hoses. Getting to the lower hose clamps wasn't easy, but I got it done and now all is as it should be.