They could be. They are the right size (15x6). You need to check the stamped code next to the valve stem hole.. will be something like... "K 1 y m d XX ", The K is for Kelsey wheels, the 1 is a plant reference. The 'y' is the last digit of the year, m is the number of the month (9=Sept, etc), 'd' is for the day, and the XX is the application code. 'DF' was the code for '67 and '68 Z wheels I think?
Check this reference on CRG: http://www.camaros.org/suspen.shtml#Wheels
Gary W / 09C 69Z28-RS, 72 B 720 cowl console rosewood tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe, '70 Mach I
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55-'56-'57 Nomads, '55-'57 B/A Sedan