First, I expect everything is metric, threads and O-rings. You have nothing to lose by trying to fix it and reuse it. Plug the holes in the valve to keep crud out of the valve while you are working on it. Be sure the adapter block is clean before re-installing it.
I would try to remove the broken screws by using a fine point center punch and tapping them counterclockwise to turn them out. I would try this before drilling. Socket head cap screws can be hard, if you try drilling use a left hand bit, if you can get them. It looks like a locator pin broke as well replace that as well. The O-rings (metric) should fit the OD of the hole with out force and be just slightly proud of the surface. Too big can prevent proper sealing. I don't think the broken area in the center will affect it.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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