Someone can answer those questions, but it is beyond my depth of knowledge. You can find parker parts on ebay, but fit is tricky on some.
You need to make sure you have all the internal parts as well, plus you are missing some screws.
I will leave it up to some of our more knowledgeable members to answer what you need.
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"The Parker gun was the first and the greatest ever." Theophilus Nash Buckingham
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