What kind of brackets and screws do I need to mount a 20” chainguard for my bike?

Question

Update:

20” tires

Answer 1

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A chain guard 20" long or for a bike with 20" tires?  https://www.amazon.com/Fenix-Plastic-Chain-Various...  

If you can't figure out how to mount something that simple, I suggest going to an actual bike shop.