I have a 1992 saph cossie. Ive fitted a new T34 and it doesnt have anywhere to put the lambda sensor. So i plan to weld a boss to the down pipe! Im not sure my lambda sensor is the right one as everyone says its a m18x1.5 thread buy its been measured at m12.1.25 thread. Anyone shed any light on this as i cant find a boss to fit it?