1966 Chevrolet Impala Sports sedan front quarter
Just visibile here you can see that the taillights have migrated into the rear bumper, where they would live for a few model years.

1966 Chevrolet Impala Sports sedan profile
The roofline of the four door hardtop models of this era differed less from their sedan siblings than previously, and this policy would continue thru the 1974 models.

1966 Chevrolet Impala Sports sedan rear quarter

1966 Chevrolet Impala Sports sedan rear
Extra lights grafted on to the rear fender caps hold the amber indicators required by Australian law (US used the red lenses below but these were disabled here).