Lane....I have been doing some further research about the part numbers from the AIM you quoted in your first post (BTW, my AIM states that the page was released on 06-16-1967 and there are no revisions and it shows the same info that you state).
According to my 1967-1969 Camaro Master Parts Catalog (GM 691A, issue July 1969) those part numbers (8 - #9122836 Nut and 6 - #9419303 Screw) correspond to the part numbers and descriptions in the AMK catalog that I referenced in an earlier post. I am including some images of the CMPC pages showing the part numbers. So if the hardware you are searching for is not the same as described here, I would think that we should then be looking for different part numbers.
8 - #9419303 Screw.......this is a view of the heading of the screw section describing the coding on the screws
This view is a shot of the actual part number listing showing the coding of the screw.....refer to the first image to decipher the coding.