I had Samson sports spinning racks on my ND mini tower when I had my Pro 190. Samson racks fit ND Towers, they look and work great. I believe these racks are by far the best aftermarket racks made. They spin very smooth with positive locking on each end with pull of a handle. I sold the boat and the racks or I would send you some photos. Racks are not cheap but from fist hand experience they are fist class all the way and I would highly recommend it.
Hope this helps and Good luck!