Ping Ultrasonic Sensor servo mount

For Parallax Ping Ultrasonic Sensors, expects 25.24mm center to center 16.2mm transducers on a 45.5mm x 21.25mm PCB, may work for some HC-SR204 sensors I found a few that fit.
2 back styles, one can hold a 2nd sensor, one is blank.
See the entire Glowstrand Robot at http://www.coolkidsrobots.com/robot/glowstrand