Slow build 71 Scamp 440

So I got my mounts for the engine and the washer that is built into the nut has split in two. Anyone know where I can get a new one our a set. Just need the nut/washer combo really. Or........ Can I just use a hardened nut and same size hardened washer?? Don't really see the need for an exact replacement. I leave it to you the experts.
"1973 up spool mount"

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