Janome Serger Replacement Upper Blade fits Models 134D, 234D, 434DR, 534, 534D and others The genuine Janome replacement Upper Knife Fits: Janome/New Home Models: 104D, 134D, 203, 234, 234D, 303, 304D, 334, 334D, 434, 434D, 534D. Kenmore models: 385.1564180, 385.16631, 385.16633790, 385.1664190, 385.16642090. Pfaff Models: 752, 4752. NOTE: It is recommended that you replace both the upper and lower blades when you replace the blades. Not doing so can damage the new blade.