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Exposure Diablo is a helmet light, it doesn't have the little saddle mount that the bigger lights have (Strada, Maxx D, Six Pack, etc)
Also, the standard clamp for those bigger lights is 31.8 which won't fit most bars at their (skinnier) extremities.
You can get 'clip on' saddle-style mounts for them but I've not used them to know if they have the angle adjuster. I just have the helmet mount and a basic rubber bar mount.
If you loosen up the bolt on the light, you can rotate this to whatever angle you want – maybe there's a female helmet Exposure bracket that will fit?