I thought there was a sticky thread on this forum, but I can't seem to find it.
There is this from the Antique Radio Forums.
https://antiqueradios.com/forums/vie...?f=19&t=201537
The Early Television Museum also has some parts available.
https://www.earlytelevision.org/
BTW, there is a thread that someone posted about restoring a TV that included how he made a replacement yoke cover from scratch using plastic and something like thin model aircraft plywood. I think it was a older RCA.