I cannot help from experience, as my vehicle is an x244. The dash panels on the x244 are secured by T25 headed screws, but the column cover screws are of a smaller diameter, and Pozidrive 2 headed. The lower pair are fiddly to replace, perhaps I need a stong magnetic screwdriver.
T25 bit when measured as you would a hexagon bit is about 3.5mm.
T20 bit is close to 3mm.
T15 bit is slightly under 3mm.
For security bits the central hole is larger on the similar sized hexagon bit.
From looking at the ptoto, I am thinking Torx. I appreciate that the screws are recessed, but is there any way in that you could either take a rubbing on a piece of paper, or an impression on bluetac, to measure or compare.