This is a model of part number 10039. I used it make a new one out of aluminum. I am building a heater to affix to the bottom of this plate. I plan to print on to Kapton.

[EDIT]
Uploaded a current photo with the Kapton tape on the print surface.

I uploaded the STL and a SolidWorks part file. If you have access to a CNC this will save you the time it took me to measure it all out. If you do replace it I would recommend replacing the springs that support it too. The added weight causes the original ones to compress too much.

Use this aluminum plate with this heating system: http://www.thingiverse.com/thing:4924