The new sky box came out on the 28th Jan, it only has 2 tuners I'm afraid.

I've got a thule hangon 9708, if you can afford the flat bed types get one of those as its a pain strapping the bikes down. Ones that hold 4 bikes are hard to find got to watch the weight tho. Also for hangon types you need cross bar things for full sussers and you have to watch the bike wheels as they can be too low to the ground so need to be removed.

Try blackcircles.com better prices than most and will give you an idea of what is available.
if they come up with nothing select delivery only.

Ps don't know what the c is for should be a speed and weight something like 91 w if you've not got the right size that could be the reason you're having issues searching online.

The levers come MOTO style anyway so the rear will be the right way round as a front, but its easy to flip the pad contact dial round for use on the other side of the bars.