There's no images of that robodudes on the internet,so, i used the Garry's Mod screens.
utCobalt (black one)
utCorrosion,green visor, (blue one)
utthorax,yellow visor, (green one)
utSyzygy,grey head,(yellow)
Working also with just "robot" and "(color) robot" tags (sometimes).
Better works with 0,9 strength.