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They are either an m6, m7 or m8 with m6 and m8 being the most common. Check your local hardware or parts store and get some metal locking ones to replace the long acorn style that were originally there. The metal locking ones are like the nylon insert nuts but they are designed for high temp locations. After losing 2 sets of the acorn nuts I switched to these and haven't had a problem since.
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