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LeChef
TvH
They should come with IS to PM adaptors. If not your LBS should be able to give you some.
140mm rotor at the back dials down the power a bit but in general you should have a smaller rear rotor as the brake needs to do less work anyway. If you want 160/160 get the L3.
Shifting the Flatmount versions you have shouldn't be too difficult id have thought.