How do I take this off?

I'm trying to replace my old Master cylinder with a wilwood unit. When I unbolted my old MC the entire pushrod and springs came out... what needs to come off this in order for my new MC to work? What part is the actual pushrods that I will be reusing? Is it the part after the spring assembly? If so how do I get the old part off? I have yanked and yanked but no budging.. I saw a screw on the end of the spring housing do I need to take that off 1st then pull?