Check again. If non-av grade O-rings are still made here, they’re damn hard to find - I spent a week calling around for some.
By the way, his O-rings have to be made of something that doesn’t bond to his anodized aluminum and are not just water but gas tight (so if you use his lights in an explosive atmosphere, you don’t start a fire). They’re a little more complex than “any old o-ring.”
West Coast Gasket could easily have a mold made. They could punch out 10,000 of these every day or two. This isn't rocket science o-rings...We're talking flashlights here.