Search on this site, it's been covered before. Essentially, only the originally supplied rivnuts will work, nothing else. Been there, tried it, failed, fell out. I did find some on the flea bay, they weren't cheap, but did the job. None available at the mo. I don't know what the aftermarket manufactures side steps use. Else drill a big enough hole in the bottom of the chassis to fiddle a nut up inside :)
 

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