Okay, I've tried searching, to no avail, and this continues to confuse me.
This headlight is exactly the style I want:
In other words, not the H4s that have the sort of flat bevel on top, with the pebbled/frosted appearance. According the Pelican parts page, the H1s also appear to have that H4 style flat bevel.
I want the ones in the picture: very gently rounded from edge to edge, uniformly convex, with no pebbled or frosted top edge.
I've seen them up close on other early Porsches (356s included), and I'm pretty sure I've seen this style with both Cibié and Bosch lenses.
I don't need unobtainium NLA parts. If I can use readily available H4 guts, that's fine. $1,000 per headlight won't do in this case.
What's the solution early car experts?