QuadStorm

Found this hanging - what is this and where should it be connected?

No numbers anywhere.  Would most of these Chinese quads take universal parts - ex. gas cap, full wiring harness, etc?

I'm new to this forum and new to quads.  My friend gave me his old mini quad - looking to clean/fix it up for the kids.  Does anyone know what type of quad this is/how to tell what type it is? I've been trying to locate any numbers but haven't found any yet.