This is a simple plug/plate for the Honda Navi front signals when replacing the OEM assembly with an LED. This fits a pretty standard 9.5mm diameter mounting bolt. This does still require a >30mm washer on the inside to keep the plate fixed; however, I was able to flip the existing OEM washer around and reuse it.
Printing
I printed mine at 0.2mm layer height with gyroid infill at 20%. There is not much stress on this part, so it seems pretty solid at this infill. Printing time was a little over an hour for both.
The author hasn't provided the model origin yet.