Re: Regular SD humbucker with black pole pieces
That's likely a custom shop order if you want them jet black, seeing as none of the pickups come stock with black polepieces except for the Full Shred (hex polepieces), Invader (large cap hex polepieces) and Screamin Demon (only half though...the hex polepieces are black, and the normal flathead screws aren't).
That said, the new Black Winter set has black nickel (or smoked chrome or whatever it's called) polepieces as stock or at least they look like they do, so that might make it more feasible for black nickel polepieces to be a shop floor custom thing on other models.