This guy is a great parts seller but I don't think this is an actual 914 part, is it?

Fuzzy strip on ebay link
Click to view attachment

Yes. It’s a headlight arm brush.

Yup, for early cars

I do not see it in the parts diagrams

I concur that it is an original part. I also agree it does not seem to be in the parts catalog, but then there are many parts not listed in the catalog.
I believe it is meant to keep insects from entering the front trunk.

I have 5 early 914's and they came on every one of them. 914rubber makes a nice reproduction.

We sell them as a complete kit with the rubber flaps and the holder for about what he's selling the brushes for

https://914rubber.com/early-headlight-brush-set
Ours are also nickel plated for better rust resistance

I have bought a few parts from the eBay seller... super fair but they have a habit of sand blasting the parts, so depending on the part it may retain sand that needs to be cleaned.