RS-4 Missing Screw Help

[Cross post from AZ] Anyone know the part number, or where I can find it, for the screw next to the red arrow? The dealer ordered a part, but I’m certain its a hpfp part, where this arrow is pointing to a screw that goes into the head below the HPFP.

I’ve noticed a very strong fuel smell lately and it seems to be coming from the area where the screw is supposed to be. Hoping this is the fix.

http://images.tapatalk-cdn.com/15/12/27/9a57b6b9b5ca067289fb5b3422372800.jpg

Really appreciate the help.