ISO Hardware size for Bed Sliders

[BaliMawr]

Looking to mount a bracket from one of these two threaded holes. I'm assuming they are for the bed sliders? If anyone could give me the hardware size, or point me to a parts fiche, I'd appreciate it. Thanks!

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[BaliMawr]

Bump- what are the bed sliders called? Can't find a parts diagram for them. That might help with the hardware.