A reasonable close-to-original color - at least for me - is Rustoleum's "Satin Nickel Metallic". I ground down a few original casting ridges, primed with high-build primer, wet sanded with 320grit, applied color and satin clear. They look fantastic. It's not an exact match, and I don't have a side-by-side before/after (since I did them both at once), but I'm definitely satisfied.
Freelance Renaissance Man German Cars, Japanese Bikes, Guitars, Adrenaline