I have a wide face. I made a wide face gasket by flattening the model valve provided.
I'm new to CAD, 3D printing, and Valve Index ownership. Unfortunately, I have a large head which interferes with the latter. For reference, my IPD is 72 and not a single pair of headphones fit me. So, I took Valve's index_hmd_assembly.stl and squished it a bit in Blender.
There's a whole and bisected version for those with smaller build platforms. Magnets not included.
For padding, 3/8" weather stripping from Home Depot works well enough.