Ah yes, yours was one of those, wasn't it. I think I've only seen one other besides our two, but forget where.
Think they may be a bit large for helmets and shoulders, but I don't know what you have in mind. Termi shoulders, perhaps? Hmm, perhaps still too large. It would be a great head for a Khorne Daemon Prince with the BBoS, though...
What sphinx of plascrete and adamantium bashed open their skulls and ate up their brains and imagination? Imperator! Imperator!