1974 Scamp fiberglass bumber?

I'm new to mopar sry in advance for newbish questions. I purchased a 1974 Scamp my rear bumper looks like this one (not my car)



I think its the same as a 1974 dart bumper??,,,,any fiberglass versions out there? I can only find this earlier style down below





thx in advance,

Bad Shrimp