Not sure, but you can get an interior screw kit pretty cheap. I guess most of them are somewhat correct. My problem is that the part the screw heads would hold onto are broken on the top left and right. Anyway, they look like black pan head phillips with concave top maybe 3/4".
Rick's 1st Generation Camaro has these as a separate set. That's where I got mine.
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI
I had a mismash of screws in my carrier, but 1 or 2 looked exactly like what Rick's sent. Therefore I assume those were the originals and Rick's sent exact replacements.
They also claim they are exact replacements.
PS, I also have Totally Stainless' kit.
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI
For anyone finding this thread later - the Rick's screws were a perfect fit. I've heard that the Firebirds had chrome screws and Ricks are black anodize but they look fine.