Early A-body package tray
The outfit you want to be talking to is
REM Auto, who make the package trays for a giant range of cars, including pretty much all A-bodies. Been awhile since I had occasion to call them, but the REM people have always been responsive and helpful when I had detailed questions about parts, and I imagine if there's an issue that needs fixed, they'd like to know about it. Their research and detail work tends to be very good; they even know and cater for the difference between '60-'61 and '62 A-body package trays even though they're cross-compatible.
They don't sell directly to end-users, only through vendors; they're the source for a lot of the vendors, which is why it's worth spending a few minutes to do some comparison shopping—get the parts list for your car from REM and then ask
Dante's for a quote, find out just
how much excessively Layson is marking them up (for example), etc.
(I would not be shocked to learn outfits like Classic Industries and PG Classics are getting them out of China instead, tho).