I don't have the pattern so can't help. But I do know that size is not the only thing that can be different in 60 degree rulers. Some of the rulers are marked in inch increments along the edge (measuring the length of the edge), others are marked in inch increments from the center of the base to the tip (measuring the height of the triangle).This does make a huge difference if you are using the markings on the ruler. Also some of them have a blunt tip, and others have a sharp tip. The sharp tip is better for some patterns, the blunt tip for others. If you read through your pattern you may be able to figure out which type markings and tip you need.