They were mandated in 74. I have done tons of research. When the model year 1974 started, it was actually a guessing game if you car had them or not. My car has mounting provisions for both non-shock and shock mounted bumpers.
Ok cool. Thanks. Then maybe you can find some. That said, there have been lots of people who've modded those numbers and tucked them in nice. Maybe you could do that if you can't find some.