If you can't find the smaller twister rulers just take any smaller square ruler and use 1/4" quilters tape and make your own. Just lay your smaller ruler on top of the larger twister ruler in the center to get the angles that your lines need to be and put on the tape to make your lines. You can either remove the tape when done or leave it on. You can even use a black fine tip sharpie to mark the line permanently. You can either use store bought square rulers or for the odd sizes use plexi and cut the size you want. Be sure to mark the size and other info with sharpie for future reference.