Can anyone tell me what thread size/type is used on the transmission fittings at the '05 XJ8 radiator? I managed to cross thread the top line and need to find the appropriate tap and die. Nothing I've tried has quite fit. Maybe metric? Maybe pipe?

 

In case anyone is interested, the transmission oil cooler line fittings are M18x1.5. I couldn't find a tap and die that size on the weekend, but autozone carries a thread chaser for O2 sensors that is that size and that worked to clean up the threads at the radiator.