JAKE.
it has been my observation on NJ cars that both top fender bolts closest to the plenum has a extra dome style washer as per my image supplied in reply 3.
Not saying this way is set in stone just something I have seen when fiddling around with NJ. have exmples of January, March and April build dates where this was done
I only have 1 engine compartment picture from 1980 before any sheetmetal work was done. October 65 car had the same 2 washers. Car also had no crush triangles in drivers fender. I believe the bolt heads were SEMS, will check on it next week.
Edit: coming back to this, I had a mix of RBW and SEMS installed at the time but after going through old bolts and cleaning them, I've found all the original RBW bolts which will be going back on.