I am going to fit one of your column rads and would like to know the measurements
Measurements for mounting radiators can be found in the installation PDF under the specification tab on each radiator product page.
The measurements can also be found on the Revive radiator website or download the PDf in the attachement to this answer.
You will also need to consider that the foot is 100mm from the finished floor level.
Top tip, if building the stud wall for this radiator to be fixed to, use Ply or OSB board between the studs even if it is stuck using gripfil to the back of the pasterboard as this gives you a much larger target for your fixings accross the area the radiator will be hung and give you more margin for error.