Adjustable sensor mount

Our robots use loads of sensors. Sensors of all types! But how to attach a variety of sensors to the robot easily? How to make it adjustable?
This sensor mount was born out of that need. A simple, three piece adjustable sensor mount(two 'ends' and a 'middle') that is assembled with two bolts was just what the robo doctor ordered.
Currently this bracket can be printed in different lengths using different mid parts.
bracket_mid_5cm results in a ~5cm long bracket
bracket_mid results in a ~9cm long bracket
bracket_mid_15 results in a ~15cm long bracket
bracket_wide is a wider end piece to be used instead of the bracket_base piece in order to mount a wider variety of sensors to the end.
//////// UPDATES /////////
4/1/14 - Increased depth of bracket_wide to increase stiffness, increased surface area slightly to prevent gaps when printing on lower settings.