I would go with used mountain bike raised bar like seen here:
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Hey R14
Question - I have been looking at lots of bars and have fancied getting a carbon bar if there is one in a sale but they are all 650 or even 700mm wide. With the M Bar being 530mm am being an idiot? I don't think I want to try cutting a carbon bar down, so should I focus on a good aluminium bar that I can reduce?