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I've been able to replace most of the parts of a Chromebook that had hot chocolate spilled on it with plarts from old c720 Chromebooks, with the exception of the touchpad. It fits just fine, all lines up and the flex cable looks identical to me. However, none of the three that I've tried will work on the c740. The only reason I'm changing it is that it has lost its click and drag capability; still can use the touch feature. With the c720 touchpads, I get nothing. It's like it isn't even recognized as having a touchpad connected.