Amazon.com: CKPSMS Brand -Bobbin Case #125291& BOBBINS Fit for Singer 15-88, 15K88,15-90,15-91 Sewing Machines
Amazon.com: ACICE Sewing Machine Bobbin Case 125291,33486 for Singer 15-75, 15-88, 15-89, 15-90, 15-91, 15-125, 15K88
Amazon.com: SINGER | Spare Bobbin Case for SINGER Sewing Machines, Tension Screw to Sew Thicker Threads, Fits Class 15 Front-Loading Bobbin Systems - Sewing Made Easy