Attached are pics of the screw on my 69Z, Norwood car assembled 05A. The only place in the 69 AIM I could find the GM part number of this screw was page 223, under the C60 option covering the AC system. P/N-9420152 screw and P/N-3825419 clip are called out. AMK unfortunately does not have a listing for this screw which would show the screw, but they do have the heater hose clip (AMK item #B-10005 if you look for it on the on-line catalog, or p. 151 in their catalog).
The screw is a self tapping, 1/4-20 x 1/2", with indented head and the manufacturer's marking "RBW". AMK bolt #B-12302, 1/4-20 x 1/2", indented head with "NL" markings and an encapsulated lock washer is close.
Any time I find a survivor Camaro that still has its original hardware still in tact, I try to get pictures. Unfortunately, this screw is often removed and lost because it along with the alt. bracket is removed for a number of maintenance related jobs. I do have pics of this screw from some “top notch” restored cars, but the RBW screw was “the original” according the owner and replated. So that is all I have to go on at this point.
Does any one have their original, or pics or an original, screw? Pics of this screw along with a note on the build date and plant would be great!