Restarting this thread since I'm working in the same area and have a question. I'm changing the H4 glass from clear to amber and there is a rubber gasket around the glass itself. The original rubber gasket needs to be replaced and I need new ones for the new glass. Here's a pic:
I thought it was this part (911-631-115-02) but it's the gasket shown in the above thread but it's not the right part.
Any advice would be much appreciated,