I would go without screws for the interim since it’ll probably be fine, but use a good aluminum tape to keep the SSD down to avoid problems - don’t bump it if you can help it since the SSD WILL be loose. What I would do is see if you can buy an SSD with the required screws, as some sellers will include them for not much more knowing about buyers like you buying one without the screws or other integral parts, so they sell the screws and SSD as a pair. Most don’t, so you’ll need to buy them piecemeal AND an SSD or buy it as a pair.
Your best bet otherwise is to buy a complete screw set from a used machine someone is stripping for parts. If you are missing no other screws, you could probably ask a Mac repair shop if they have any and offer then a few bucks to get what you need. Chances are they’ll probably have a dead machine to get them from that’s a match.
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