That Zebra is an old SC60w; it's at least three years old, and they don't make them anymore, unfortunately. They do have a newer version of it out, the SC62d that I'm thinking about getting. I was thinking about getting an SC600w mkII, but they've been out of stock of them for months, unfortunately, and I have no idea why. If they come into stock again, I'm going to get one as soon as I can.

The mounting method is a Minoura accessory mount; here's a link for one from the place where I bought mine:

Universal Cycles -- Minoura CS-500 Headset Spacer Accessory Mount

It's attached with a twofish lock-block.