Guaranteed to fit Elna sewing machine models:
eXcellence 580+, eXcellence 720PRO, eXcellence 790PRO

Guaranteed to fit Janome sewing machine models:
5300QDC, 5300QDC-T, Continental M7 Professional, Continental M7 Quilter's Collector Series, Memory Craft 550E (MC550E), Memory Craft 6650, Memory Craft 6700P, Memory Craft 9450QCP, Quilt Maker Memory Craft 15000 (Version 3)