Oil pan, tranny pan and water pump bolts

[phred]

I need to order some helicoils for the oil tranny and water pump on a truck I'm working on. Can anyone verify the oil pan is 3/8x16 or 5/16x18. I know the tranny is 5/16. What about the water pump?
I know the the oil pan uses a larger bolt at the front and rear.


Thanks

 

[Pedestrian]

Oil pan is two sizes, 5/16 and 1/4 national coarse
Waterpump is 5/16 coarse as well