Guaranteed to fit Husqvarna Viking sewing machine models:
Designer Topaz 20, Designer Topaz 25, Designer Topaz 30, Designer Topaz 40, Eden Rose 250C, Opal 650, Opal 670, Opal 690Q, Sapphire 835, Sapphire 850, Sapphire 855, Sapphire 870 Quilt, Sapphire 875 Quilt, Sapphire 930, Tribute 140C

Guaranteed to fit Pfaff sewing machine models:
Creative 2.0, Creative 3.0, Expression 150, Expression 2.0, Expression 3.0, Expression 3.2, Expression 3.5, Expression 710, Performance 5.0, Performance 5.2, Quilt Expression 4.0, Quilt Expression 4.2, Quilt Expression 720