Which of these would have been used in Ireland during the IWI and Civil War?
I guess the first one?
Yes, Willie, the first one. However, the same model with solid wheels (like on the centre model) would also have been seen in Ireland during the Anglo-Irish War and Civil War:
This is
Sliabh na mBan, one of the 14 Rolls Royce armoured cars left to the National Army post-Independence. She's still in working order