This is my take on brackets to hold a 200mm x 213mm glass bed on a Wanhao Duplicator i3. The biggest difference between this one and others found on Thingiverse is this one you can install without removing the adjustment screws which hold the heated build plate on. The brackets lock into place with "small" size clips and using the bed screw head as an anchor point.
I used ABS for better heat tolerance. If installing over a buildtak surface make sure that the bed screw heads have ~1mm clearance around the head for a tight fit.