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As just suggested, it's probably just M6 (probably the most common size in my hardware bins), and in your shoes I'd probably just find a match ...

The little 10mm drive bolt? I'd find a replacement from an Ace Hardware, or small hardware store. It just holds down that metal retainer

Fuel rail is out. All the injectors look OK to me and they all test out fine for resistance (all at 13.9 ohms). I don't know how to test if the old...