For mine I made two rectangular plates from 10mm thick, (approx 3/8") Aluminium.
Each plate has two holes that match the rack mount.
The two plates measure 10mm thick x 20mm wide x 96mm long.
Two 8.5mm holes at 76mm centres.
The four M8 bolts will need to be 10mm longer than standard.
Sorry, I can't remember how long the standard bolts are.
regards,
Tony,
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