These carbon motor brushes (without springs) have dimensions of 5.5 mm x 5.2 mm x 15.5 mm, while the original brushes measure approximately 5.5 mm x 5.5 mm. Using these brushes will result in a better fit in the brush holder.
Fits Singer models: 15-91, 15-125 and 201 gear driven machines, 221, 222, 237, 239, 401, 401A, 403, 403A, 404, 500A, 503A, some of the 600 series TS.