That is realy painfull. I've never seen such a thing. If you have no chance of getting some warrantydeal, better go looking for a used reardrive. What is broke, is the end of the small gear, And that's only sold, while matched, with the big gear, toghether called bevelgear. TLM has it in it's pricelist for:
Gear set 11/32 v11-sport
Article number: 01354630
Ordered € 906,02