Look also at Cibie Airport model 35's...similar size to Hella 450's..
Fellow with pseudonym "JAX", IIRC...was very helpfull getting me a set for a good price. JAX posts here.
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Head light took a rock
I like the 35's because of their black housings, all metal construction.
When done ( with either the Hellas or Cibies) ...protect them with heavy gauge clear vinyl. That way you're always "ready" and don't have to take off those goofy opaque covers.
Wil