Glassbed Corner Brackets for FlashForge Dreamer for 3mm Plates

All found models of brackets for FIashForge Dreamer for 3mm glass plates did not fit on my device.
Because the print bed of the Dreamer is wider than the 230mmx150mm glass plates ( http://tinyurl.com/he4vune ) the plates were not fixed safe on the bed and shifted around. The most of the found brackets were also too high.

So I made my own based on the idea of ADesigns: http://www.thingiverse.com/thing:965872

Because the size difference of the plate to the print bed is higher in the depth t