Guaranteed to fit Singer Sewing Machine Models:
120U, 1300, 191D, 195K, 196K, 20U11, 20U13, 20U43, 241, 245, 251, 281, 281-1, 281-2, 281-3, 291U1, 291U3, 31, 331K, 331K1, 366K, 400W, 44, 451K, 491, 491D200GA, 491D300GA, 591D, 600W, 660A, 771, 95, 95K40, 95K41, 95K60, 95-40, Centurion 121D

Guaranteed to fit Pfaff Sewing Machine Models:
134, 463, 563

Alternate Part Numbers: 505643, 161066