I’m nearing the end of my first restoration project and need to attach the plastic gear cable guide. however I have a problem.

I don’t have the screw or bolt that attaches the plastic cable guide to the bottom of the BB shell as it mustve gotten lost when I sent the bike to get re-painted. I dont know what I need to attach the cable guide as when I inspected the shell I saw two holes and neither appeared to have threading. I’ll attach photos of what the guide looked like before it was sent off to be re-painted. Do I need a screw/bolt or a rivet? Can these be replaced?

Thanks for any help!
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