Finding "second hand" Chaos Knights (the old ones, labelled as "Chaos Steeds & Riders" and designed by Trish Morrison, Nick Bibby and the Perry brothers) is very difficult and mostly very expensive. Over the years, I have managed to collect 10 of them, one after the other, when their price was affordable. Some came without legs, only the torso was available. To cope with this, I have bought legs of latest editions. I had also bought the steeds without riders sometimes.
Anyway, here they are, painted in a red-black-bronze khornish theme for unit cohesion.