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They're called m.2 (m dot 2) screws. There are 4 different kinds (I've personally only ever seen the 2 popular ones) (your owners manual might say which but I doubt it, you'll probably have to ask lenovo if you need to know which kind specifically).
you can order a set containing all of them online for pennies.
The computer will run with it unscrewed, but if it bothers you then you can use a *small* piece of electrical tape to secure the ssd to the screwmount until your screws arrive
