I have four unused R-Theta heatsinks from Peter Daniel's Aleph-X group buy. These are 11"x11" and I have attached an image of the extrusion profile. They are anodized black and have a few small electrode marks on the ends of each which is how they came from R-Theta. They are still in the original packaging and were only ever opened for inspection. I'm asking $250 USD for the four pieces, plus shipping within Canada or the US only. For Ontario buyers that are interested, I am occasionally in the Ottawa, Toronto, and K-W areas, so I might be able to arrange to meet for pickup. These are heavy, so they won't be cheap to ship.