These guys have replacement bolts for many derailleurs. Only a few are posted though.
Precision Billet Precision Billet Derailleurs CNC Bike Components Proshift
Depends on which bolt is missing and what derailleur your referencing.
If you no longer have the bolt then I would suggest taking the bike or derailleur into a bike shop and have them provide the proper bolt to complete your derailleur. They can also advise for your specific derailleur how to reattach. Not all derailleurs work the same.
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