2 issues, on mine they hold tight to the original and I did not want to break anything by forcing them to unscrew.
Also no longer needing the originals, I posted them for sale here and on Maserati life, so they better stay on the original,
As for the connecting the radio to the bezel, I think at least 2 of the 6 M5 bolts holes line up to the rears sides of the modified nezel
so possible to bolt them nice and easy