They are hollow metal trim strips, extrusions, I believe aluminum, painted flat black and contain floating studs. They get attached from the backside, underneath the dash.
They are refered to as a "blind" installation since there are no exposed fasteners.
They are made to length for this application as the ends are finished, not cut.
I just looked and Wilkinson does not show them in the dash board parts illustrations. He would be the most likely source of replacement parts though since he has had alot of these parts reproduced through Santiago Detomaso and has imported them exclusively. Most of the other vendors get their parts from him now. You should call him about them.
I am told by those that know him tha tDetomaso is notoriously difficult to deal with and subject to all types of "conniptions" that even Steve Wilkinson can't put up with?
I've never seen anything like them other than on the Pantera. For sure they are simple industrial trim items in Europe for 1970.
The studs and nuts are metric.
Don't know if they are specifically "furnature/trim" items but probably are? The only question really is who was the source to Detomaso, do they cross over to another manufacturer, and are they obsolete?
Your guess is as good as any.