Hey, I called Acura HQ about my wheels. The best they could tell me was they don't even paint the wheels, but get them through an outside vendor, which was classified info.
I called Honda HQ, they said the best bet would be to call an Acura dealer and see if they can tell you who makes the wheel. From there, call that companies customer service and see if they can give you a paint code.
Other than you finding a local ITR owner or coming to CT, that would be easiest.