I'm quite sure member here, Bill Alphin reproduced those, plated in correct zinc dichromate.
He had a few boxes full of them at Chryslers at Carlisle 2 years ago just freshly done and very reasonably priced.
They looked spot on.
This bottom plastic piece with lip 3501124 will be, and is, the toughest cassette player part to find

cassetteauto2.JPG