headlight relays

Agree that Bosch, Hella, and Cibie are the three readily accessible major-brand lamps worth looking at; they're well made of quality materials. But even if we disregard the off-brand junk (there's a lot of it!) and look only at these three good brands, there's a pretty large range of performance; they're not all equivalent. You're right that the Hella and Bosch have too much vertical separation between low and high beam (set the low beams where they're supposed to be and the high beams are too high…pull the high beams down where they're supposed to be and the low beams are too low). See here and then here and also here for comparisons. Also be especially careful with Bosches; there's a glut of super-cheap Bosch 7" round H4 headlamps on the market right now. They're actually motorcycle headlamps, not E-codes, they're surplus from Harley-Davidson production after they quit using that headlamp. Because worldwide motorcycle headlamp specs are pretty lax, these are not a good choice whether you're on 2 or 4 wheels. Quick ID, the word "MOTORCYCLE" and the marking "SAE M" on the lens, without any E-mark. An E-mark is an uppercase E followed by a number, in a circle -- such as (E1) or (E4). The number doesn't directly signify anything about the design or performance of the headlamp; see here and here for explanation.

And yeah, the Cibie is pretty much the only good H4 with a convex/domed optic lens for a period-correct appearance on a sealed-beam era American car. There's one decent convex/domed clear-lens option, too, from Harley-Davidson; see here.