As long as the gasket seals, I'd weld up the two cracks, and use a flat washer on the screws. Weld it from the filter side, and grind it back as flush as you can. That metal is pretty hard, it should weld fine if you are a good welder. Or you could torch weld it, or even braize it. I'd probably weld it with my mig. If I didn't have the mig, I'd torch weld it.
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