If you cant see the green dot, I'm offline :P
You will need a M2 to PCIe adaptor like @chetansha has suggested. However do check if the T20 supports it, as that is a 4th gen Intel. [I have T20 and T30 in my office]Yes, the moment I bought, item was removed... Looks like it was the last one.
OT... My existing drive is hynix nvme 512 GB one... Is there a cheap way to use that in Dell poweredge t20 server?
If not, I will be more than happy to take it off your hands