Guaranteed to fit Husqvarna Viking sewing machine models:
Brilliance 80Q, Designer Diamond Royale, Designer Diamond deLuxe, Designer Ruby, Designer Ruby Royale, Designer Ruby deLuxe, Designer Topaz 20, Designer Topaz 30, Designer Topaz 50, Eden Rose 250C, Sapphire 835, Sapphire 850, Sapphire 870 Quilt, Sapphire 875 Quilt, Sapphire 930, Sapphire 960Q, Tribute 140C 

Guaranteed to fit Pfaff sewing machine models:
Creative 2.0, Creative 3.0, Creative 4.0, Creative 4.5, Creative Performance, Creative Sensation, Creative Sensation Pro, Creative Sensation Pro 2, Creative Vision 5.0, 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