Specs
3.2 GHz Core i5 (I5-6500)
Retina 5K, Late 2015
https://support.apple.com/en-ca/112434
Copying Data From Old to New HD
Attach the SSD drive to your Mac using a USB to SATA adapter.
Using DiskUtils, format the new SSD drive as APFS with GUID Partition Map.
Clone the old drive to the SSD using Carbon Copy Cloner - https://bombich.com.
Replacing HDD with SSD
Parts
Instructions
https://www.youtube.com/watch?v=ZbnhuZoxkI8&t=5s
https://www.youtube.com/watch?v=vzhjGV-ULMk