I just got this Matthellini 6" End Jaw clamp, after seeing several pictures of them in the FB tapers groups. I couldn't find one over here, but B&H shipped me one from the States (with the additional expense that entails, of course). I am really glad I ordered it, though; it is awesome! It can securely clamp rails/beams that a SuperClamp or similar would have no chance with.
When it showed up, I was surprised, in a good way, to see that it was anodized or coated black. The photos I had seen were all in silver.