ARB Rack 4913020M Tube Size?

[RaisedByWolves]

Considering getting an ARB Rack (4913020M) but want to ensure I will be able to mount my RTT with my current set up.

Does anyone know the tube size of the rails on the ARB Rack?

Gobi is 1" and after selling mine I still have the Axia Alloy 1" clamps that I would like to use.

Thanks