Guaranteed to fit Singer Sewing Machine Models:
150 Futura, 250 Futura, 2638, 2639, 2662, 350 Futura, 3962, 451K101, 6518, CE100 Futura, CE150 Futura III, CE200 Futura, CE250 Futura III, CE350 Futura III, SES1000 Futura III, SES2000 Futura III

Guaranteed to fit White Sewing Machine Models:
972, 979