I have only seen regular bolts on the floor cover, but copper bolts would make sense, since that location is prone to rusting. If you have the rest of the radio installation instructions, what is the spec number for the bolts? If it is a mil spec MS90765, 6, 7 or 8 (along with a dash and a couple more numbers, which will represent the size and length) these are just regular gr5 or 8 bolts.
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