The file 'HC-SR04 Ultrasonic Sensor Mounts: No Prongs 3D Printer Model' is (stl) file type, size is 9.9KB.
Remixed from the excellent design of ssaggers, I simply removed the prongs from this design which seemed to get in the way of the sensor being flush to the mount.
no_prongs.stl | 44.6KB |