I own that very shotgun, the model 21. I purchased a left hand safety for mine in about 1970 from a parts catalog for a High Standard that a friend had puchase. I can't tell you though if the model 20 is the same. The 21 is a variable choke slide action. I have never had a problem with it. Numrich Arms (www.gunpartscorp.com) has a cross reference section- its on the left side of their home page. You can look up a Sears or Western Auto or Montgomery Ward firearm model, and it will give you the maker, and corresponding model of that maker. Sears Model 21 evolved from the model 20. parts lists for comparing various Sears modesl are available at www.histandard.info
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