Is yours the retina 2014? Those can take standard NVMe M.2s with this adapter: https://www.amazon.com/Sintech-Adapter-Upgrade-2013-2016-2013-2015/dp/B07FYY3H5F

Is yours the retina 2014? Those can take standard NVMe M.2s with this adapter: https://www.amazon.com/Sintech-Adapter-Upgrade-2013-2016-2013-2015/dp/B07FYY3H5F https://www.amazon.com/Sintech-Adapter-Upgrade-2013-2016-201... I've done this on a '14 13" MBP so I can help if you have any questions.