Check local hardware stores! We have a great local store on the beach that has very organized Just a few weeks ago, I discovered they had well nuts! I was excited to find the source as the ones that held the stereo amplifier in place tore when I removed them. Well nuts were all under a $1 each IIRC.
In my case, I wasn't worried so much about getting an exact replacement as I could but a matching bolt and be good to go.
I'll take a look at the sizes on my next trip.
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