you should be able to get it by calling shimano. not sure if they will talk to anybody though. you might have to get your lbs to contact shimano. usually they will either send a part or just warranty the whole thing.
If the OP is running a close ratio cassette, as is common in DH bikes, this is not the best plan. The radr cage makes the upper pulley travel at a greater angle to the horizontal to better track the profile of wide ratio cassettes. On a road cassette, you're going to get crappy shifting in the bigger sprockets & have to run more b-tension than normal.
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