Here's what Omnium have to say:

Supernova set up for your Cargo & Mini-Max.

Includes all the products you will need to set up your Supernova lights; front & rear lights and the Omnium seatpost clamp and Dynamo Rack Mount.

Here's what Sentient says:

So you have a 6v3w dynamo hub? And you want a set of lights that is ready to bolt on?

Sadly you will have to do some minor cutting of wires, installing crimps or soldering, and tidying up of cable routing to do in the workshop. But this kit should only take 30 mins to install if your happy to perform simple electrical wiring jobs.

If you are buying this for the Mini, then we recommend installing a RIVNUT into the Mini Rack, to bolt the Upside Down Front Light directly. This means that you will have a spare Dynamo Rack Mount, which will be of no use. Unfortunately there is no option to change this, or get a discount for not needing it. 

NOTE 1: The Rack Mount is only for 30.0mm OD tubes like those on the Cargo or Mini-Max rack. This will not immediately go onto the Mini rack (but there are lots of potential ways to bodge it, or come up with a neat alternative mounting. 

NOTE 2: May not be compatible with the tilting rack bracket! You might be able to tilt with enough slack in the wire, but you will not be able to remove the rack quickly unless you install a quick connector of some kind. SON make a lovely one, but equally you could use some cheap spade connectors.