I can't believe they couldn't find a motor that "fit". I hope you didn't pay them for that information. It looks to be a 3/4 size machine to me, but there are plenty of black clones and 3/4 Singer parts machines. It sort of sounds like they didn't want to go to the effort to save this machine and hunt down a motor for you. Maybe someone here has a 3/4 size donor machine that could help you.