you will need 4 printsthe 3-24 is versoin 3 with 24mm round leg diameter, the 3-28mm is for 28mm diameter.the diameter corresponds to the original plastic tube ends (black).if you need diffrent diameters you can simply scale the prints.Just in case you want to tip me with Bitcoin:1C7o7HMLkMkZKSZREF4TFEBYX458cf5xy4