The names for the ones you're looking are:
Dwarven Mounted Fuser (Y/B/R)
Golden Orb Myrmidon (Unique)
And the Ram-head versions:
Galeshi Ram Charger (Y/B/R)
Mountain King (Unique)
A friend of mine owned hundreds and maybe even thousands of Mage Knight miniatures (jup, we were big players in those times
). So if you can't find them on ebay, send me a PM and I''ll give you his e-mail adress.