Thank you all for the input and advice. Its great when we all support each other. I have splinted the original plastic via super gluing a strip of plastic to the underside. I have also contacted Stern via email and phone. (It took some effort via phone as they want to use email mostly for now) It appears that Stern is going to supply me with the repair kit needed. I also learned that this is not a part for sale from anyone and must come through them. Anyone else with this issue or issues like it should heed the advice of simply contacting them directly.
Thanks much and thank you all for making our hobby and pinball community a great thing to be a part of.