A Scott Drake product that did not fit the Scott Drake heater core. I did some trimming on them, but they just would not work at all....WAY to small. After I cut them up it was too late to return them. After reading the description of the SD heater core, part #HC1, it says modification or removal of the end caps will be required. It needs to be stated on this product summary that it will not fit part #HC1. I bought my heater core in a rebuild kit and not individually.