Single Port USB 3.0 Male to Female AUX Car Mount Flush Cable Waterproof Extension for Car Truck Boat Motorcycle Dashboard Panel 1ft

The mounting holes should be 1 1/16 inch or 27mm in diameter (they are circular) The outside diameter of the flange on the outside part as well as the nylon nut for mounting the connectors in place is 1.25 inches. Link to the 1x USB 3 version