Sheesh, I should have looked toward Sheldon to begin with:
http://sheldonbrown.com/saddles.html#seatpost
Built-in Clamps
Most newer bicycles use seatposts with an integral saddle clamp, which secures the saddle by one or two bolts.
- Two-bolt seatposts use a pair of bolts to hold the blocks of the saddle clamp. Loosening either one of these allows you to slide the saddle back and forth. Loosening one and tightening the other allows you to adjust the tilt. (If one of the bolts is larger than the other, the larger one should be loosened before making any adjustment to the smaller one.) This type of mechanism allows a finer level of control of the saddle tilt, because it doesn't rely on the meshing of teeth in serrated parts, so this type of seatpost is also known as a "microadjust" seatpost. (Single-bolt seatposts are also sometimes called "microadjust," with questionable accuracy.)
So just going by this, any 2 bolt clamp should do the trick.