What is this called (Dash seal???) and do I really need it?

I'm working on a '67 Dart and I took a picture of this "dash seal" before doing paint. I'm not sure of the actual name for these. I took them off before painting and now I can't find them. Do I need them? Should I look harder to find them? I'm guessing they serve a purpose but it's not obvious to me.

Any comments/suggestions are appreciated.

Here is a pic of the driver side.
View attachment 1715792232


Fish do not have those! Least not my undisturbed 69, and we are cousins!

One thing for sure is other than some light primer, they look pretty good and solid, the clips are spartan! Pull them and save in any case!