The employment of knock-off wheels, state side, was quite limited. From
my personal experience, the 1965 Corvette aluminum wheel option had
ko's, my heavily optioned '67 roadster did not. The wheels were
visually the same, but the later cars bolted on in the conventional
My MkIII Sprite, HAN8L-58497 and built between January and February
1966, has knock-off wire wheels.
To quote Terry Horler "Wire wheeled cars bound for North America changed
from 'eared' spinners to octagonal nuts during 1966 to comply with
safety regulations, effectively leaving only right-hand drive cars with
'eared' spinners." And finally "...home market cars being the last to
change to hexagon nuts in 1969."