Pretty sure they were ABS or something similar, its a hard plastic vs the later 79-81 flexible material. I repaired a couple small cracks on my 78 flares with a 2 part product that said it was for ABS & some other plastics, it worked great & has held up for almost 15 years now.
I would look for good condition used OEM flares before any of the repro ones, I bought a set of what was the popular brand at the time from one of the big firebird parts shops, was a darker grey & had the welting attached, they looked great out of the box but fit was pretty bad, mounted OK but didnt follow the contours of the fender/quarter right, would have needed some work that I chose not to do , returned them & just repaired the originals.
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