If you were talking about a threaded fastener in 1/4" material I might be able to agree, but not the sheet metal on these cars. I would not personally use a riv-nut to mount anything substantial - I did use them to mount the brake prop valve. For the battery, I ran a strap of 0.90" from bolt to bolt, so a giant "washer."
You don't want that stuff coming loose.
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