I need stl files for a metal stamp for hot glass

I want stl files of a metal stamp similar to http://www.spiralarts.com/products/pc/LION-STAMP-p194.htm but based on the Lions Head Bridge samples below. I may also need further designs. These are to be printed on a 3d printer and formed using the lost wax process. I would like the stamp to be similar to the second image but with the head surrounded completely. The end result should look something like the third image. The shape must not catch on the hot glass.