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M3x5x5. See the BOM (section "Fasteners") on the main page ("Thing Details") of this project. There is a size and there is a link to the store. You can search on that page for the text "Brass knurled insert" to make it faster.
I bought in another store, a month ago. 100 pieces cost $1.99 with free shipping (to Russia). But you have to be careful and choose among the options for sizes in the options is the size of "m3x5x5".