Extension for Prusa Y carriage to fit RepRapPro heatbed

This is a couple of pieces that bolt to a Prusa i3 Y carriage and allow a RepRapPro heatbed insulator to be bolted on.

So I really like the mounting system for the RepRapPro heatbed (http://www.thingiverse.com/thing:20968 and http://reprappro.com/wiki/index.php/RepRapPro_Tricolour_heatbed_assembly). It bolts an aluminium top surface, the PCB (a MK2 style PCB bed) and an MDF insulator together, and then the insulator is mounted to the Y carriage with a three-point, spring-loaded mechanism.