I would just get the Shubb Ukukele Capo. This is what I use (not very often).
Yes, they're referring to the black fingerboard.
The Shubb capo is Great because you can also, adjust the string pressure just like your finger pressure. Too, much capo pressure on the strings will usually make the sound sharp. That's why Guitar capo's aren't recommended on a Ukulele because the clamping pressure is made for a guitars steel strings.