Looks good.
They should be correct for the '66 to '68 Mustang...
I'd say that you have a winner. Yes. Those are the correct 15" Wiper Blades and correct metal finish. They'd be correct for a '66 Dearborn built Mustang. Kudos to your Swap Meet find.
In '69, The Mustang went to 16" TRICO Blades....
Just for FYI, 16" TRICO Blades work perfectly well on '65-'68 Mustangs... though not "Technically" correct.. I ran them for years and years with no issues.. When adjusted properly, They don't even rub or touch the bottom windshield trim or gasket.
)
Tony K.