1970 Dart front side marker light pigtail?

On the front the harness is supposed to be permanently attached. The bulbs are meant to be changed by removing the lens.
If that is the case I'm wondering if the tabs (see the pics on the repro pigtail) are supposed to be bent over thereby holding the socket in the housing. Looking at the pics they don't look like springs. I could see how people would rip them out instead of removing the 2 screws. My housings are still a mess so its hard to tell.