An additional wrinkle, for others. Some models, at least of the 1278, sometimes have a thinner keyboard flex than is usual. Mine was .007" instead of the .009" of the replacement. The .009" flex WILL NOT fit into the connector. I had to call a dozen Mac repair shops before I found one that knew about this. They were able to provide the proper keyboard.
So when you get your new keyboard, check the flex to ensure it fits. Otherwise, you might wind up doing the job twice, as I did.