I have 600-a14 from amazon (link as https://www.amazon.com/gp/product/B0721ZKSLH/ref=oh_aui_detailpage_o05_s00?ie=UTF8&psc=1) and Samsung 960 EVO M.2 SSD 250G (link as https://www.amazon.com/Samsung-250GB-Internal-Solid-Mz-V6E250Bw/dp/B01M211K53/ref=sr_1_9?s=electronics&ie=UTF8&qid=1527744559&sr=1-9&keywords=960+evo)
You have to teardown the motherboard completely because the slot of M.2 at the back of the motherboard which the CPU and GPU is on the front of it. also you need prepare a screw, I just find a suitable one but don't confirm the size.