guess there is some plastic on it, just not like the 3 spoke type
top view
there are 2 kinds this one and a gear/lightning bolt style. both are identical except the logo.
assembly left to right , top plate and screws, center plate with plastic bushings, rubber donut, and faceplate with plastic that the screws go into.this part is bonded to the metal.
rear view ,assembled
you cannot buy these or the parts other than salvage or evilbay maybe.

