I wish it was that simple! Spark plugs are made in 3 sizes. The common ones are 14mm and 10mm but the Punto 16V uses 12mm plugs which are very rare. My local Halfords warehouse does not stock any 12mm plug sockets, only the 10mm & 14mm ones. However, I obtained a socket from a tools web site but it's too big to go down the hole. What is needed is a very thin-walled socket - it may be that a special socket has to be obtained from Fiat but has anyone overcome this problem? By the way, the 8V engine uses 'normal' spark plugs.