Mark, they officially still referred to it as Endura through 1977-1978, but as we discovered, Pontiac basically tagged the name 'Endura' to anything that was urethane coated and could absorb a impact. The official Pontiac description for the 1977 nose was. "Sandwiched between the RIM fascia and steel reinforcement is either an energy absorbing device made from low-density cast urethane foam or from a thermoplastic material injection molded into a honeycomb pattern.”
So the 1977-1978 Birds had a flexible urethane fascia with with molded thermoplastic injected material to allow the soft fascia to hold its form. The 1979's had the redesigned nose where the grilles were under the headlights, and the flexibility of that fascia was much more apparent especially to the left and right of the Pontiac arrowhead emblem.
Bumpers today use the same basic design. a soft fascia with a molded, injected material behind it to hold its form.
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