SL500 Silver Arrow Edition?

So my dad recently got a 2003 (i think) SL500 from mediation (long story) and it says "Silver Arrow" in the interior and I think on the outside too, I'm not sure. I have never heard of these "Silver Arrows". The seats are a totally different color than the regular SL500's from the same year. And the paint is a really different silver than any other Mercedes I've seen, it's really hard to describe.

Has anyone else heard of these "Silver Arrows"? Is this car harder to find or something?

SL 500 silver arrow was made in 2002 the last year for that body style. Actually a rare car hard to find. Its some kind of package with different wheels and interior.