Sew-classic.com is one of the most recommended places to purchase parts/accessories for your vintage machine. Her site is "generally" organized by what machine the parts fit. The 201-2 is a short shank machine, which is common in vintage machines. If the site (or any other site you might go to) says it's a short shank foot, it will fit your 201-2.
Just for your general information, Singer machines 15, 221 (featherweight) and the 66 all take the same feet as your 201 unless they are really old.
bkay