Hi Justin. Welcome to our little corner of the 'net.
If Bosch no longer carries the part, I think your next stop would be Ebay, Kijiji, Craigs list, and the like in the hope that you can find someone on there with a broken router with a good base that you can scavage for parts.
You could also check ereplacementparts.com. They sometimes have part stock for hard to find items.
Sometimes I wonder whether the world is being run by smart people who are putting us on
or by imbeciles who really mean it.