I went through the same search good luck.
I found one at quarterarcade and ordered it. I just looked their Web site and didnt see a second one.
I have the old bent rusty one off my DK. It could be reused if someone was determined to make it work. They are glued to the Plexi pretty well.
My recommendation would be to look for an entire bezel on bay with the piece attached, order it, pull the piece and resell.