Emblem Thread Cutting Nut

[Stubs68]

Can anyone tell me the nut and hole size for the thread cutting nuts that fasten the Dodge and Power Wagon emblems onto the hood of a 68?
I see that **NOT ALLOWED** carries them as well as ebay. I have tried a few different sizes and also tried to enlarge the stud hole but they never grip and hold like the original ones that have the correct opening. If you happen to know the hole size and nut size for the thread cutting nuts please post an answer. Thanks to all!

[Stubs68]

Another Sweptline owner helped me out. Here is the part number and seller should anyone else need these. NAPA part #665-1347, 3/16" stud Thread Cutting Nut.