Speedmaster RX7 rotary engine stud kit fits all 13b engines. Includes factory washers. Our engine fasteners are made from aircraft quality 8740 high tensile strength chromoly steel and cold-forged to ensure molecular integrity.
Good for at-home 1/2 stud kit, not for CNC machine fit, if you plan to drill out your plates and housings with a drill press this would work fine for you but if you want to machine this to a slip fit tolerance (a couple thousandths) on a CNC these wont work as i found out the threads are not concentric they are slightly angled.