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So these are the parts numbers for the Thule Aeroblade that fits the Micra :

Bars : Thule AeroBlade ARB47
Feet : Thule Rapid Traverse Foot Pack
Fit kit : KIT1623

Those are really expensive...

I have the Thule AeroBlade, and it works fine. You just need to buy the appropriate fit kit. I could retrieve the parts numbers if you're interested. 4965