Original Side Trays for Singer Featherweight 221 & 222K Cases. This side trays will only work with the style of case that does not have the wooden blocked corners. The wooden blocked corners are to support a full top tray. See photo above for style. The red side tray will fit the 221K and 222K cases that have the mounted hanger instead of the screws for the tray to hang on. Feel free to contact us if you are unsure as to whether or not the tray will fit.