How did you decide you need silver for the wheel?
I'm having one wheel off my Anny re-painted as we speak. Some of the OE paint was flaking off, and it had been poorly touched up in the past.
I took that wheel, and a stock silver wheel, and let Jeff decide which one he thought which one would be less work. Upon close inspection, the stock wheel appeared to be painted silver out to, and including the lip. The Anny wheel, where the outer edge isn't black, appeared to not be painted at all. Looked lighter than the stock silver wheel...naked wheel w/clear was our guess. Rather than try to re-do the lip on the (darker) silver wheel match the 'naked' lip on the Anny wheel, Jeff elected to work with the Anny wheel where all he had to do was sand/refinish a couple spokes, and then shoot black, no need to touch the outer naked lip, except for some protective clear as needed. This will be the second wheel he's re-done for me.
We didn't discuss what it might take to strip any factory silver off the lip of the stock wheel, but I'm sure there's a chemical that would help, somewhere. Might be easier to strip an entire wheel...
About the Anny silver, I tried finding that code recently, and the best I could come up with was YF from various sources. Problem was finding it today using that code. I bought some touch-up in a small bottle, but it's a tad too dark, so I'm still looking.
See
http://www.sccoa.com/forums/showthread.php?90693-Titanium-Paint-Code&highlight=paint+codes