you dont unless you order it that way. coil color is by chance, they use black and cream coils in whatever combo they grab. so ya might get two black, one of each (the zebra/rev zebra) mentioned above, or two cream. just like the old gibson buckers
Get a hold of one of these guys. They'll take care of you. They're both members here on the forum. Many of the guys here have bought from them both and never had anything but good things to say about them both.
A good friend of mine is a Duncan dealer. I was ordering a pair of Antiquities for another friend's guitar, and he wanted a zebra neck and a double-creme bridge. When my dealer friend placed the order with Duncan, he was told "we don't do that," referring to the coil matching. When they arrived, guess what we found? Zebra neck, double-creme bridge.
Unfortunately, this is not true for Antiquities. They charge custom shop price on special requests. The good dealers will check bobbin color out when they receive them so they should know what they have.
Just FYI, bobbin color is supposed to be random from the factory but based on the 400 or so I have purchased I have found way less zebra's than cream or black.