Concerning the SSD i also wonder what exact type of M.2 standard works. I want to use a Samsung SSD 960 EVO, which is using M.2 2280 standard. As i asked a tech-guy from my local Apple Store he stated that in MBP Early 2015 13” any form-fitting type of SSD will work. The big question is what kind of M.2 Standard is used exactly? Is it 2280, 2242 or 22110? The closest optical resemlance seems to be 2280 format. Do i really need to get an expensive OWC-SSD or can i use my pick of choice as well? As i understand it this standard was changed in MBP Late 2015 13” at which only OWC replacements work properly. If anyone who already replaced the SSD of a MBP Early 2015 could share his experiences i’d be grateful.