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Didn't your unit came with one? Maybe contact surefire directly. It's just a piece of metal stuck on with double sided tape. I can you can just cut a piece of acrylic or something and just tape it on.
It's just a real crappy piece of steel. The cuts on both ends are uneven. I would just find a suitable piece of "anything" and just tape it on. If you're in an industrious mood, you can just cut a sheet off some siding with tin snips, paint it black (or whatever color) and stick it on there.