Can someone tell me the thread size in the water pump bolts, specially the one that access the cooling system. I have a thread stripped and was thinking ordering heli-coils ahead of time in case that the thread is damaged. I believe there are two sizes if someone has them I will be thankful......

 

Water Pump Bolt Kit ( BOSCH Engine ) - Land Rover kits from Atlantic British

sizes listed

 

I tapped mine to 3/8.... Worked fine

 

I've a "seep" from one of the bolts and I believe is the thread that is worn or cross-threaded, don't know what the previous owner or whoever worked in my Disco did. It started small and progressively has gotten worse, could very well be a bad gasket but I doubt it so I'm going to order heli-coils and a new water pump. Are the heli-coils tje best or there's something else in the market better