If you're swapping out the headlight bulb on your Honda GL1500 Goldwing or Valkyrie and need those little adapter rings to make an H4 bulb fit properly, this is exactly what you're after.
These rings come from Cycle Machine Works, and they're made specifically for this application—no hacking or jerry-rigging required.
The manufacturer part number is H4-RINGS, so you know you're getting the right piece for the job.