Guaranteed to fit Janome sewing machine models:
104, 106, 108, 110, 360, 380, 381, 405, 415, 419S, 423S, 4612TM, 4618LE, 4623LE, 531, 609, 6147, 712T, 808A, COMBI 10, COMBI DX502, DS3500, L-344, L-352, L-392, L-393, LR1612, LR1618, LR1622, Memory Craft 5001, Memory Craft 5500, Memory Craft 6000, ML3023, MS3015 (My Excel 15S), MX3123, RX18, RX18S, RX22, S-3015, S-650, S-750, SD2014, SL2022, SR2000, SX2122, TB12 Thread Banger

Guaranteed to fit Necchi sewing machine models:
FB12