I'm looking for two specific ones, from the 6th edition release. 1 each of the two-headed one and the really furry one sniffing the ground.

I know you said you were looking for two specific minis; but have you ever checked these guys out?

Gamezone Minis

I have bought some of their Chaos Knights just to see how they looked and they are totally awesome. Each horse has an individual pose instead of one generic pose.

You can get them from FRP games.