Singer accessories are not made just for one machine. The same seam guide that works for my 1918 Singer treadle works for my 1952 and 1956 Singer e machines and my 1974 Elna. On looking at another manual, it looks like your machine is a slant needle. The number makes sense, too. The Singer 301 and the 400s are slant needle. I don't know about the 500s, but it seems a 347 might be. If that's true, a generic foot will not fit - only a slant needle one. I get my parts from April1930s shop, but sew-classic and others have them, too. Look at this schematic and see which one looks like your machine. It is not a high shank, for sure.
http://www.april1930s.com/html/sewin...differenc.html
My LQS sells the guide and screw for $4.95. I like it, though it's a bother to swing out of the way when a seam is wider that 1/4".