replacing the keyboard assembly

I have replaced the keyboard such as you described. It takes a bit of time, but not all that difficult. Yes, the main connection pad is some what larger on the one you purchased. There are about 11 small screws that hold the keypad in place. The keypad has a built in ribbon cable permanently attached so this must be removed along with the keyboard from the palm rest. Lift up the semi clear plastic cover on the back side of the palm rest, then vey carefully lift the small clip, it is tiny brown in color, then gently pull out the small ribbon cable. The rest should be self explanatory. It can be done.