I checked 4 unrestored cars and find 2 with phos and oil hex head screws , both 1971. Two 1973 converts, both phillips pan head screws ,phos and oil finish with spatter overspray. One is the Blue 73 you refer to. The 73's have the spatter overspray on side markers, rubber seal etc. which the 71's do not. I would call the judge to find out what he was looking for. AMK hardware is close but often not concours correct. Using 73's for 71-72 reference is not always accurate either. I took pics but not working here for me. you can e-mail at perkinsrestorations@gmail.com and I can forward to you.