Hello. I'd like to ask a question as I need to upgrade a couple MacBook pro computers and I need to purchase some SSD adapters such as the ones linked below but I'm not sure which ones exactly.

https://www.ebay.com.au/itm/253380251897
https://www.ebay.com.au/itm/263449601095

So I have a late 2013 MacBook pro 15" with 512Gb.
Also a late 2012 MacBook pro 15" retina with 256Gb.

I purchased this 1Tb Crucial M.2 SSD (Crucial MX300 1TB 3D NAND SATA M.2 (2280) Internal SSD - CT1050MX300SSD4).
https://www.amazon.ca/dp/B01L80DH1Y/...088100_TE_item

The problem is that it doesn't fit. I'd like the 1Tb SSD go to the late 2013 MBP 15", and then use the removed 512Gb SSD of the MBP 2013 in the 2012 MBP. So both computers get an upgrade.

After researching I'm getting just more confused, I wonder if you could shed some light.

Thank you so much for your help. Kind regards.