What I would like to mention is that the Apple Rubber company in NY (no, they aren't that kind of company) make all sizes of o-rings and are especially noted for the manufacture of silicon o-rings in just about any color you can think of including a translucent uncolored one.
If anyone were to go into a scuba store and tell them you need a few spare black o-rings, they might just give you a few for free.  A scuba tank uses an o-ring as the contact between its valve and that of the regulator's first stage.  Most all divers carry a few spares in their gearbags just in case  -  even if a scuba store wanted to sell you a few rather than giving them away, they're dirt cheap...especially compared to that specimen you're wanting to protect.    ;-)
 
Gregory     (PADI Divemaster, #180640)

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