We get a lot of questions like: “What is the ‘functional’ difference between these two different lenses. The TN4 appears to be what is installed on my two 914s, but I’m curious about the TN1-TN2 style. Different / better beam pattern?”

Here are a couple of resources:

• Porsche 914 & 914/6 Fog / Driving Lights
• Horn Grill Fog and Driving Lights

We'll keep adding to the TK Wiki as we learn more.