If you can't find something pre-painted in D4S (Raven or Crystal Black Silica) and if you don't have the ability, room, etc to paint it yourself, here's a trick, for stuff that is not going to be closely scrutinized.
3M 1080 G212 Scotchprint Gloss Black Metallic Vinyl Wrap is nearly identical to Raven (D4S). It has a bit more metallic on the roll but when applied (and stretched), it's very close to the factory paint. You can order a sample for a buck and then stretch it over something to see the end result.
http://www.metrorestyling.com/3M-108...ss1080g212.htm