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While fiberglass will offer virtually zero crash protection, just about all of these need some custom body work to make them fit right, and fiberglass is easiest. Maybe talk with the shop thats going to do the paint work, and see what they say. Also, if you do find NOS, may be warped up bad as yours.
I agee to what Vette 5.5 wrote. I think he got it right. I bought a True-Flex fiberglass bumper for my 81, then didn't care for the fit. I could have made it work, but opted to go with a reproduction urethane front bumper. It too required fitting and some tooling of the bumper. It's pretty straight, but not as arrow straight as I could have made the True-Flex. However, my reasoning with going with the urethane was ultimately based upon the mindset that when I go to sell my car it'll be more original and therefore will be worth a couple hundre bucks more than one that a perspective buyer may think was 'hit' and the bumper replaced with a cheaper bumper cover. The other reason I went with the urethane is that I'm doing an original restoration and back in the day a slight amount of waviness was typical and so it doesn't bother me that there is some waviness. But what is important to you may be a whole other thing.