I think the 3D+ cranks come in 160 from Rotor...

my crankset is 3D30, not 3D+, my mistake. In 170, compact.

You can use all the same rotor cranks. 3D+ are the most expensive and lightest, 3D30 are heavier and more cheaper.

The 3d+ used to go down to 150mm. You still may be able to find some, though the US rotor site only lists to 155 now, I still see a reference on one of the intl sites