Emblems/Icons For Old Oil Drums?

[bigcc32]

I've recently acquired a pair of Oil Drum sunglasses that are in pristine condition, except that the O emblem on one of the arms is missing. They're an older generation, so they don't have the raised O's that the newer drums/rigs do.

Does anyone know where I'd be able to get an emblem or set to replace it?
I know that gascans, for example, still have flat O's, and I was wondering if any emblems available for other types of glasses would fit in she slot.

 

[marc2040]

Medium Square Icons​

 

[bigcc32]

I got some of these from eBay. They don't fit. Either they're smaller than advertised, or those aren't actually the ones that fit Oil Drums. It's a good thing there was a return policy on them.