MacBook Pro 13" Retina (Function Keys, Late 2016-2017) SSD - iFixit Store
INDMEM NVMe PCle SSD 512GB 3D TLC Flash Hard Drive with Tools for Upgrade 2016 2017 13" MacBook PRO A1708(EMC 2978/3164 Non-Touch Bar Models(Late 2016 -Mid 2017 Year) : Electronics
Touch Bar MacBook Pro models have non-upgradeable SSDs, seemingly under-sized batteries - 9to5Mac
Upgrading the new MacBook Pro is still a major pain