MacBook Pro 13" Unibody 中期 2010 底座更换

Those are actually not seven identical 3 mm screws. The screw located at the ventilation side next to the three 13.5 mm screws does not have a shaft as compared to the other six 3 mm screws.

How do you reattach the little black pads to the bottom of uni-body case?

I thought it was a #000.