See if this works with your machine
Formerly Wave D
Made from .25-inch thick quality acrylic. Double edged ruler with two undulating lines, great for stitching spines or waves. Use with the HQ Ruler Base and HQ Sure Foot.
Ruler Dimensions: 12.75″ x 3″. This is the actual size of the ruler, not the size of design that will stitch when used with a longarm sewing machine.
Part Number: HQC HG00558
Guaranteed to fit because it is a part.