My turn signal lens were over 50 years old and flat. I wanted to easily improve the stock design so traffic on coming could see the turn signals better. This is a simple Cone design, you will need to use either clear or amber filament that is translucent. If you are running LEDs you might be able to just use PETG and clear coat it since all PETG has some translucence to it. I do include my cad file if you need to modify it.