Pretty easy to find Duraace 9000 165mm stages cranks on eBay, easier than the cranks themselves...
You could go for the rotor inpower but no idea whether they are any good.
I've never used them myself, and I've only met one person who had them. He was complaining about the fact they'd stopped working for no apparent reason.
@Brommers started
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Pretty easy to find Duraace 9000 165mm stages cranks on eBay, easier than the cranks themselves...
You could go for the rotor inpower but no idea whether they are any good.