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Your wheel color doesn't really have a name. You can buy a new one that may match your others, but if you buy used or replica it may not match. The type-s wheels are always tricky it seems. Someone may chime in here that knows a little more.
All Type-S wheels are "gun metal".
There are different shades of "gun metal" that Acura uses unfortunately.
The only way to know for sure when buying the wheel is to compare it in person.
Buying a new wheel online you risk getting a different shade. Sometimes it's really noticeably different, sometimes not.