They are m6 x 1.0. Helicoils are fine, just make sure you thread them in enough so that part of the coil does not stick up past the oil pan mating surface. I always run a tap first because the built up silicone and grime causes the bolts to easily strip. I also used the Moroso stud kits will good results. Make sure you lay the pan and brace on first, then screw in the studs.
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