Manifold nut size
 

Starting a new thread since the one I was in was resolved. I had one of the six nuts vibrate loose and is gone. Just got this schematic from the dealership and I'm in the same boat as the tech; it doesn't look like it's on here. If anything, it MAY be the SU003-0051. Thoughts?

http://i789.photobucket.com/albums/y...psf2afd315.jpg

I don't see it on that diagram. Remove one and match up at hardware store and just put a regular and lock washer on it and you should be fine.

It's #2 since there is no corresponding bolt with that nut.

I believe #2 is the small nut to hold the heat shield on. Look at top left. There is one there too near that part of the shield.

#2 is a heat shield nut those come have a 10mm head; which nut vibrated loose?

I believe you are correct; it appears to mate with #1. The locknut that holds the header to the motor on one of the three studs near the exhaust ports.