You can really use any granny square to do this. It doesn’t have to be the same size or style as mine. The idea is to make a large granny square, then cinch the top and bottom a lot and the sides a little less. So if you are using a granny square you already have or one that’s different in size, just follow from row 24 on. The chain 80 is for the straps, so you can adjust those on your preference.