The moulding is a vinyl moulding with metal in the center to keep is stiff. The moulding actually snaps in place over the tack strip that is used to keep the headliner stretched. As far as I know nobody is reproducing this for the 1970. Your best bet is to get some out of a salvage yard.
70 SS 396 Chevelle
62 Impala Sport Coupe
2001 Grand Prix GT
Maybe the purpose of your life is to only serve as a warning to others?
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