Here are the parts of the piston after cleaning, along with a portafilter.
Here is a pic of the new gaskets. They are extremely hard and seem to be very well made.
Here is a pic of the piston shaft. When I pulled it from the machine I noticed that it had deposits on it and was not smooth. It is my guess that the gasket at the top of the group head was not able to form a good seal because of the depostis and that is why I was getting a small leak. I scrubbed it the best that I could to bring it back to a smooth condition. Hopefully this will stop the leak.