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I have aftermarket steel headers on my honda civic dx 1.6l and i have a bad exhaust leak. Where all four pipes leading from the head meet before going down below the car there are three bolt and nuts that go there to hold the pieces together. I have lost two of the three nuts and it is leaking bad out the header. Does anybody know the thread size because i have been buying nuts left and right and none of them fit. the thread is not rough thread its finer. the nuts fit on a 14mm wrench.

 
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I dont remember the exact size of them but the thread pitch is 125 and i want to say they are m12 125 pitch nuts. Put you some red thread locker on these too. You will get tired of doing this tho. I wound up putting a new gasket in mine and welding the entire outside together after rebolting it back together several times.They work so much better as long as you dont have to keep pulling the headers for something. Let me guess ebay headers???? If so they are complete crap as far as the bolts staying in it.

 
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You could go with a slightly longer bolt and have a second nut on each of them to lock them in place.... They won't back off then AND you can remove them still if needed... Pretty sure there isn't a clearance issue there.