Can you post a picture of your bracket? I have welded some back together in the past with great success. If you can get it back together, all you have to do is install it without the glass in it and take it to a GlassPro type place where they will prime it and "glue" it in. It's not really glue, but a urethane made specifically for glass applications. Then you leave it up for 24 hours and you're set. If you can post a picture, I can judge whether it can be welded and fixed, and if you can't do it you could send it to me and I'll do it for you - you just pay the shipping. Alternatively, there is a good MB junk yard here and I may be able to find a replacement one for you for a better price than you can get there.

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1982 Mercedes-Benz 300CD
1982 Mercedes-Benz 240D - stick