Amazon.com: NVME M.2 PCIe SSD to 2.5 inch Hard Drive Caddy Bracket Tray with SATA HDD Cable Replacement for Lenovo ThinkPad T470 T480 1AX994 : Electronics
Looks like m.2 2280 worked out just fine for t450s : r/thinkpad
Lenovo Thinkpad T450 Hard Drive/SSD Replacement - YouTube