You need REAL Bernina feet for a Bernina machine. #37 is 1/4" without a guide. #57 is same foot with guide bar on the right side. The OS (old style) feet are called exactly that: old style. The walking foot is awesome, with interchangeable soles for open toe & stitch in the ditch. Again "old style" MSRP is close to $200 & worth every penny