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Best would be M8 inconel nuts. I have been looking for them and unable to find them. Next are the plated Porsche locking nuts sold by a vendor like Pelican parts. Grade 8 nuts are not meant for high temp and will rust out in no time. do yourself a favor and search for the Nickle based anti-seize and use it with what ever you put on. Don't use the Copper based anti-seize as it plates out on the threads and makes the studs pull out next time you remove them, you could get by with stainless nuts also.
The Porsche nuts are pricey but worth every penny next time you try to remove them.