54mm Wildman Rocket Thin wall tubing fin alignment guide for 4 fin MD high power rocket. I also included the OR screenshot of my fins as the guides use the sweep of the forward and aft end to determine the angle of the fins so if your fin profile is similar then it might work. Fins are also .16" as they are 1/8" fins but composites were added later so the slots may be a tad big if you are not laying up your fins.