This GPS pole mount fits between the front arms of the TBS discovery. The top was designed for a 3DR Mag/GPS unit but should fit most GPS units. The pole top piece and GPS holder need to be glued together, hot melt works well. Extra holes are added for tall poles that might need forward and aft support, just use a 3mm bolt and nyloc nut to hold in place. Wires can be hidden inside the pole too. You will need some fiberglass or carbon fiber tube with an OD of 8mm