I need to open my MBP Retina 13-inch. I'm confused what Pentalobe screwdrivers i should buy. iFixit tells that my MBP uses "two 2.3 mm Pentalobe screws and eight 3.0 mm Pentalobe screws" in lower case. Some forum users tells to use P4, some others tell to use P5. So which is correct and what size 2.3mm and 3.0mm is in P sizes? Can i use this driver set which has "4mm Pentalobe P2, P5, P6".