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I asked this same question a month ago or so. Use the search feature and you will find that there is no oem color as the wheel manufacturer uses a proprietary process.
I spoke with Enkei today. As others have suggested and we suspected, the 19 inch Sport wheels are painted with "hypersilver". They told me it is actually a 4-step process. They also confirmed that they do not sell any touch-up paint that matches 'hypersilver', and did not know of one that was close.
I've tried a couple of paints that others have mentioned, a Rustoleum, and a Ford color - neither of them were close enough to be used for touch-ups. It seems the search will continue until someone happens to find by trial and error a stock color that might be close enough.
I got mine done as when I bought the car it had some small curb rash. The powder coating shop blended it all in and then sprayed it. I got lucky and was able to get a shop to dismount and mount the tires for free when it was all said and done. I believe it came out to like $100 bucks a wheel. Of course that is here in SC so not sure what it would cost you where you live