I just went through that! I bought some "Vivi Nova" replacement heads, which turned out to be for clearo rebuildables. You tell by the pointy top (that of course I didn't notice until I tried to use one). I complained to ECBlend and they credited my account and are no longer selling the heads or the tanks that go with them - they were labeled "Sunrise Vivi Nova." ECBlend wasn't paying attention and didn't realize what they had ordered. I figured they were clones when I bought them, but one would think they would be clones of the correct product!
ETA: Oddly enough, I've found that the Sunrise "Stardust" clones work better than the name brand, but it could be the batch I got.