GX CS4 Cord Wrap

I'm thinking of removing the cord wrap and mounting the power supply there. Then I'll shorten the wires and everything should be less cluttered. I'll even have a place to stick the GX filter! The power supply has M4 tapped holes, so that part will be straight forward. :rolleyes:

But the fasteners used to mount the cord wrap look strange. They look like a variation of a pop rivet but on the inside, it looks like some plastic. I can drill them out easily enough but I'm trying to avoid non-reversible modifications until I get enough time on it to be confident that I won't have a warranty claim.

Does anyone recognize those fasteners?