Apple now publishes a repair manual with parts listings. Here’s the page with the screws listed out [https://support.apple.com/en-us/100551|Screws] here’s the main page [https://support.apple.com/en-us/100549|2021 14” MacBook Pro service manual]. Ones you ID’d the screws you want you can do a google search to find the most local source or Oder the screws from Apple directly here [https://selfservicerepair.com/en-US/home|Apple Self Service Repair]