Discovery 3 Kayak Roof Carrier?

Hi, I've currently got the Land Rover lockable cross bars on my Disco 3 but I can't seem to find a suitable Kayak carrier to go on them.

I've seen that there a quite a few Thule carrier options if you have the Thule roof bars but not sure whether they fit the Land Rover ones. Anybody point me in the right direction?

Thanks in advance
Simon